Premium Automatic Mechanical "Raden" Sumi-Monochrome
Premium Automatic Mechanical "Raden" Sumi-Monochrome
Premium Automatic Mechanical "Raden" Sumi-Monochrome
Premium Automatic Mechanical "Raden" Sumi-Monochrome
1530Point
SKU: AT-38SVJRBK-R_LD-16SVSV-AT-38
Color： Silver × Raden Sumi Monochrome
AT-38SVJRBK-R_LD-16SVSV-AT-38
1530Point
Couldn't load pickup availability
Next Fulfillment: May 2026
Premium Automatic Complete set
"Raden" Sumi Monochrome
Regular model with a modern twist on tradition
The Sumi Monochrome model features an arrangement of traditional "Raden" which is more subtle, and ideal for wearing in everyday life. The simple color of the freshwater shell is refined to a sophisticated shade using an original technique that tones down its saturation by applying a very thin coat of lacquer. This innovative variation on the "Raden" technique lends it a contemporary feel.
The “ra” (螺) in Raden means “shell”, while “den” (鈿) signifies “decoration”. Raden is a beautiful decorative technique where the shiny inner layer of mother-of-pearl is finely processed and scattered over the surface of a lacquer.
SPEC
- Case
- SUS316L / Silver Polish
- Glass
- Sapphire glass (Non-reflective coating)
- Dial
- Raden Sumi Monochrome
- Hands
- Silver
- Diameter
- 38mm
- Thickness
- 10mm
- Weight
- 50.0g
- Movement
- cal.9015 / MIYOTA
- Water resistance
- 5ATM
- Precious Stone
- 24 Stones
- Time Precision
- Average day difference : -10 seconds to +30 seconds
- Frequency
- 28800 vibrations / hour
- Duration
- 45hour
- Warranty Period
- 3 years for movement
※Please note that each dial is individually hand-crafted, resulting in a unique pattern that may differ from the product images. No two dials are exactly the same.
※This product can not perform “Engraving Services” because the back cover is glass specification.
Raden is a traditional decorative technique in which the nacreous layers of shells such as green turban
shell and
mother-of-pearl are carefully cut and applied to the surfaces of lacquerware and woodcrafts. Its defining
characteristic
is the way its colors shift depending on the angle of light. The character “ra” (螺) refers to spiral shells,
while “den”
(鈿) signifies inlay.
Its history dates back to ancient Mesopotamia. Introduced to Japan during the Nara
period, raden has captivated
generations across more than 1,300 years of history and continues to be celebrated today as one of Japan’s
defining
traditional crafts.
The Radiance
of Raden
The Radiance of Raden
The model features an arrangement of traditional Raden which is more subtle, and ideal for wearing in everyday life. This innovative variation on the Raden technique lends it a contemporary feel.
The Craftsmanship of
Aizu Traditional Artisans
The title of “Traditional Artisan” is only awarded to technicians working in the manufacture of traditional crafts who possess advanced artisanal skills and techniques. The dial has been realized in collaboration with Nobuichi Otake, a Traditional Artisan whose work employs sophisticated technical skills and an original sense of style.
Nobuichi Otake,
Traditional Artisan
Nobuichi Otake,
Traditional Artisan
Born in 1959, Kaneyama, Fukushima Prefecture Upon completing high school, Nobuichi Otake initially worked at a hydroelectric power station. However, he had aspired to work as a painter ever since he was a child. He happened to learn about the maki-e lacquer art profession while watching TV, and became an apprentice to Sone Takuo, a contemporary master artisan of Aizu lacquerware. After five years and five months as an apprentice, he became an independent Aizu lacquerware maki-e craftsman.
The Raden Production Process
1. Base coating
After filtering to remove any impurities, lacquer is applied to the dial so that the shell pieces can
adhere to it.
This must be done evenly and with the right thickness, since this will determine the final result.
2. Shell crushing
The shells are crushed into small pieces before being distributed over the dial, all entirely by
hand.
The shiny inner
layer of the finely processed shell is carefully crushed into small and medium-sized pieces.
3. Distribution of shell pieces
Shell pieces of different colors and shapes are applied in a balanced manner according
to the craftsman’s intuition.
The color and shape of the shell pieces are adjusted to create a gentle
gradient from the center, before finishing with
fine flakes applied through a powder tube.
4. Coating application
The lacquer is applied again to cover the distributed shell pieces.
This fills the spaces between the
shell fragments,
allowing the lacquer and shell to shine together as a uniform surface.
5. Polishing
After the layers of lacquer have thoroughly dried, the surface is polished so that the shell pieces can
reveal their
full brilliance.
Through this process, the lacquer and shell pieces become smooth and shine as one. Too
much polishing
can cause the shell pieces to chip, so this is a highly delicate process carried out with a craftsman’s
touch.
The Craftsmanship Behind
Blue Glacier & Sumi Monochrome
Shell selection
Only select portions of each shell are suitable for use: approximately
70% freshwater shell, which yields a calm,
subdued tone, and approximately 50% of the white mother-of-pearl, prized for its vivid
iridescence.
The raden dial is
crafted entirely from these carefully chosen sections.
Coloring the shell
To achieve the distinctive beauty of Blue Glacier, the reverse side
of the shell is coated with a proprietary blend of
transparent urushi lacquer and pale asagi-blue pigment.
This technique differs entirely from
conventional raden craftsmanship and offers a glimpse into the
originality and
creativity of the traditional artisan’s process.
Shell composition and placement
The dial base is composed of 70% freshwater shell for
its composed tonal quality, and 30% white mother-of-pearl shell
for its lustrous iridescence. Each fragment is individually evaluated and positioned by hand, in a
process that takes
approximately 2.5 times longer than the Sumi Monochrome model.
This delicate process is only possible
through the precision and refined handwork of a master traditional artisan.
Shell selection
Only select portions of each shell are suitable for use: approximately
70% freshwater shell, which yields a calm,
subdued tone, and approximately 50% of the white mother-of-pearl, prized for its vivid
iridescence.
The raden dial is
crafted entirely from these carefully chosen sections.
Gradient Finish
To ensure legibility of the hour markers, the raden is arranged in a gradient pattern that evolves toward the
outer edge
of the dial. The exacting vision of Knot’s product designers is brought to life by hand by the traditional
artisan.
The natural shell pieces are arranged at consistent intervals, adjusting the color and size as the
gradient transitions
towards the edge. This intricate effect is a result which can only be achieved by the skilled hand and intuition
of a
master.
Styling
An Exclusive Package,
Made for Raden
The watch is presented in a Premium Automatic Collection box accompanied by an exclusive sleeve designed
specifically
for the Raden series.
* An original watch cloth is included.
The Depth of Ink
The rich tones of sumi ink, the depth of urushi lacquer, the quiet resonance of
stillness, and the refinement that
emerges from light and shadow.
A timepiece that captures the Japanese appreciation of black—an
aesthetic of enduring beauty, expressed at the wrist.
The Stillness of Blue
The depth of the sea, the crystal clarity of ice, the quiet stillness of night,
and the majestic presence of Mount Fuji.
A timepiece that embodies the Japanese appreciation of blue—an
enduring beauty, expressed at the wrist.
Specification
【Case】
316L stainless steel
【Crystal】
Sapphire glass (single-sided anti-reflective coating)
【Water resistance】
5 ATM (water resistant to 5 bar)
【Movement】
MIYOTA Cal. 9015
(8 vibrations per second, 42-hour running time)
【Number of jewels】
24
【Accuracy】
Average -10 seconds to +30 seconds per day
(at room temperature between 5°C and 35°C)
【Display features】
3 hands (hours, minutes, seconds), date
【Warranty period】
3 years (for movement)
【Size and weight】
Diameter 38mm, thickness 10mm, weight 50g
【Case】
316L stainless steel
【Crystal】
Sapphire glass (single-sided anti-reflective coating)
【Water resistance】
10 ATM (water resistant to 10 bar)
【Movement】
NE88 (8 vibrations per second, 42-hour running time)
【Number of jewels】
34
【Accuracy】
Average -10 seconds to +30 seconds per day
(at room temperature between 5°C and 35°C)
【Display features】
6 hands (hours, minutes, small-second, stopwatch hand
(seconds),30-minute hand,
12-hour hand), date
【Warranty period】
3 years (for movement)
【Size and weight】
Diameter 40mm, thickness 13.5mm, weight 91.5g
The sign of ahigh-
performance timepiece:
high-beat movement
For the movement – the watch’s beating heart – Knot has adopted the movement made in Japan.
This
high-beat movement oscillates 28,800 times per hour (8 times a second), reducing the distance of the swing
of the
second hand and drastically increasing the precision of the watch.
“Sallaz Polishing” is synonymous with luxury Japanese-made mechanical
watches
A clear mirror-finished case, polished to
perfection by the hands of skilled craftsmen
The Knot Premium Automatic model uses a case made from 316L surgical stainless steel – an exceptionally high-purity alloy also used in medical settings – and finished with Zaratsu polishing. Zaratsu mirror polishing is an advanced finishing technique that creates flat, distortion-free surfaces with sharply defined edges. Only a very small number of craftsmen are capable of performing this process, earning it the reputation of “phantom polishing”. Today, it is rarely seen outside high-end Japanese-made watches. By polishing each surface individually, different expressions can be drawn out from the same material. This highly sophisticated technique is made possible by the veteran craftsmen at Hayashi Seiki Seizo.
Staineless Steel Case
SUS316L
The case is made from high-purity stainless steel SUS316L, a corrosion-resistant material also used in
surgical
instruments. This metal emits almost no ions that can cause allergic reactions, making it safe to wear even
for those
with metal sensitivities.*
*Please note that this does not guarantee that all individuals will be
free from allergic reactions.
Non-reflective,
coated sapphire glass
The crystal of the Premium Automatic series utilizes the same level of sapphire glass with anti-reflective coating that can be found in luxury watches. The coating is on one side only, which increases the visibility of the clock face while at the same time minimizing discoloration of the glass.
3-Year Warranty
The Premium Automatic Series comes with a 3-year warranty from the date of purchase, designed to be
cherished for years
to come.
Knot also operates its own atelier, offering repair and maintenance services to ensure your
watch stays in
excellent condition.
For more information, please visit our Repair
Inquiries page.
TAKUMI Collection
A premium automatic model crafted in collaboration with master artisans of Japan.
Premium Automatic
STRAP
The Perfect Straps for TAKUMI Collection & Premium Automatic models
