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Watanabe Kobo Handmade Watch Automatic Winding Back Skeleton Jumbo Brass “Open Heart” Arabic Numerals [NW-BAM060]

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Original price ¥41,800 - Original price ¥41,800
Original price
¥41,800
¥41,800 - ¥41,800
Current price ¥41,800


Mr. Masaaki Watanabe of Watanabe Koubou is a watchmaker who makes watches one by one by hand at his workshop in downtown Tokyo. We have worked on many watch works that are full of warmth and a tasteful expression unique to handmade.

Mr. Watanabe does everything by hand, from making watch parts such as cases, dials, and belts to assembling them. There is a wide variety of products, from simple designs that can be used for both casual and business purposes, to unique models that incorporate originality and ingenuity. Watches created through a very time-consuming process give warmth and healing that ready-made products do not have.

For the material of the case, we use materials such as brass and silver that can be enjoyed over time. The leather belt is made of genuine leather that is thick yet fits well, giving it a sense of quality and presence. With the flow of time, you will grow attached to it - it is overflowing with such warmth.


The mechanical movement is likened to the "heart of the watch", so it's a warm name.



The simple dial is accented by a small window where you can see the "heart (machine)".
(The belt color in the photo is "brown")



I feel like I can see the heart of the watch because it is handmade.


A self-winding mechanical wristwatch with a good naming that makes the watch feel like it has a heart, named “Open Heart”.

Except for the part of the machine that can be seen through the small window, it has a clean and cool impression. That's why I feel that the small window that casually opens at 8 o'clock looks lovely.


The hand-wound type winds the mainspring by turning the crown manually. In self-winding, the crescent-shaped part called the rotor of the movement rotates when worn or when the watch is shaken, and the mainspring is wound.

You can feel the time while enjoying the expression of brass with a rich texture.



tasteful brass case



A warm atmosphere unique to handmade, where you can enjoy aging



Back skeleton specification.
By vibrating the crescent-shaped parts, the mainspring is automatically wound up.


The belt material is made of cowhide with a good texture and is thick and sturdy.
It has much more durability and quality than the leather belt of a common watch.


Buckle & belt expression



thick belt. Cowhide with good texture.



A buckle in a subdued hue.



Whole, front and back (click to enlarge)


Make a difference in style with this large case that will become the main part of your style.


It goes well with casual style. (Female, around 14 cm arm circumference)



Presence is perfect. Male, around 17 cm arm circumference



It is also recommended as a gift with a "heart".


You can choose the color of the belt.

The belt is available in 8 colors: black, brown, camel, tanned, white, red, khaki, and navy.

Choose your favorite color belt and make it your one and only watch in the world.



A hand-stitched belt version is also available.





Function/Material/Size

Function/Material [Movement] Mechanical (self-winding), 3 needles [Case] ​​Brass (back cover is stainless steel)
[Belt] Genuine leather (cowhide)
[Windshield] Glass
size [Case] ​​Dial diameter: 31 mm / Case diameter: Approx. 40 mm / Thickness: Approx. 12.5 mm
[Belt] Width: 18mm/Thickness: Approx. 4mm/Compatible arm circumference: 11.5cm-18.5cm
[Weight] about 55g
place of production Made in Japan (Domestic)


Precautions before ordering

Most of our products are made-to-order, so it takes about 3 weeks to 1 month for delivery. Thank you for your understanding.
Christmas, Valentine's Day, and the gift season before White Day tend to take longer to produce. If you are thinking of giving it as a gift, please consider the delivery date before ordering.
It is not waterproof, so please be careful when working on rainy days or around water.
Because each item is handmade, the details may differ slightly from item to item. We would appreciate it if you could order it after understanding that it is one of the features and charms of handmade watches.
The warranty period is one year from the date of purchase. However, only internal failures are covered by the warranty, and external parts such as cases and belts are not covered by the warranty.
Item Number NW-BAM060
Function/Material [Movement] Mechanical (self-winding), 3 needles [Case] ​​Brass (back cover is stainless steel)
[Belt] Genuine leather (cowhide)
[Windshield] Glass
size [Case] ​​Dial diameter: 31 mm / Case diameter: Approx. 40 mm / Thickness: Approx. 12.5 mm
[Belt] Width: 18mm/Thickness: Approx. 4mm/Compatible arm circumference: 11.5cm-18.5cm
[Weight] about 55g
■ Recommended points
Handmade wristwatches made by Mr. Masaaki Watanabe of Watanabe Koubou, a watchmaker who makes watches by hand one by one. Everything is done by hand, from production of watch parts such as cases, dials, and belts to assembly. There is a wide variety of products, from simple designs that can be used for both casual and business purposes, to unique models that incorporate originality and ingenuity.

A self-winding mechanical wristwatch with a good naming that makes the watch feel like it has a heart, named “Open Heart”.

Except for the part of the machine that can be seen through the small window, it has a clean and cool impression. That's why I feel that the small window that casually opens at 8 o'clock looks lovely.

The hand-wound type winds the mainspring by turning the crown manually. In self-winding, the crescent-shaped part called the rotor of the movement rotates when worn or when the watch is shaken, and the mainspring is wound.
You can feel the time while enjoying the expression of brass with a rich texture.
What time is it? …When you look at the watch, you can see how the watch changes its expression each time, and you can enjoy the leisurely flow of time together with the watch.
Not only for yourself, but also recommended as a gift for birthdays, Christmas, Valentine's Day, White Day, birthdays, etc. If you would like wrapping, please let us know in the remarks column (free entry column) when ordering.



Click here for a list of watches by Masaaki Watanabe of Watanabe Studio


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