The Kiwame Tokyo Iwao is a 38 mm field watch offered in two dial variants: silver Ginkai and black Sumi. Time+Tide reports a stone-inspired textured dial, a Japan-made Miyota 9039 automatic movement, 100 metres of water resistance and a 20 mm strap width. Its published price and availability date are launch-era details, not confirmation of current stock or pricing.
What distinguishes the Iwao Ginkai and Sumi?
The two described versions share the same field-watch layout and reported specifications. Their key differences are dial color and seconds-hand finish.
| Variant | Dial | Seconds hand |
|---|---|---|
| Ginkai | Silver | Heat-blued |
| Sumi | Black | Silver with a red tip |
Both dials pair a textured central section inspired by rock with a smoother satin-finished outer ring. Arabic numerals mark 12, 3, 6 and 9; applied bar indices mark the other hours. Time+Tide also describes a low-profile rehaut, an angled minute track, luminous hands and a sapphire crystal with inner anti-reflective coating. These details are reported in its Iwao feature.
Case size, movement and other reported specifications
Time+Tide lists the Iwao’s case as 316L stainless steel, with brushed and polished surfaces and a push-down crown. The figures below are the publication’s reported specifications, not independent measurements.
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| Specification | Reported detail |
|---|---|
| Case diameter | 38 mm |
| Case thickness | 9.5 mm |
| Lug-to-lug | 46 mm |
| Case material | 316L stainless steel |
| Crystal | Sapphire, with inner anti-reflective coating |
| Water resistance | 100 metres |
| Movement | Japan-made Miyota 9039 automatic |
| Frequency | 4 Hz |
| Power reserve | 42 hours |
| Functions | Hours, minutes and seconds |
| Additional movement features | Hacking seconds and hand-winding |
| Lug width | 20 mm |
The feature characterizes the Miyota 9039 as regulated, but does not give a measured accuracy result or an accuracy tolerance. It also does not report independent water-resistance testing, so the 100-metre figure should be treated as a published specification rather than a test result.
Strap and replacement fit
The watch is described as supplied with a navy Italian genuine calf-leather strap, contrast stitching and quick-release spring bars. The reported 20 mm lug width gives a starting point when looking for a replacement, but width alone does not establish fit: check the strap’s end shape and spring-bar arrangement before buying. No particular replacement strap is verified here.
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Launch price and current buying information
Time+Tide reported that the Iwao would be available from 25 December 2025 at US$690 or JP¥92,400. Those are the article’s launch terms, not confirmed current prices or evidence that either variant is presently in stock. Current price, availability, shipping, warranty and sales channel are not established by that report; verify them with Kiwame Tokyo before making a purchase decision.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to assess the Iwao from the available information
The published details make the Iwao’s practical comparison points clear: its 38 mm diameter, 46 mm lug-to-lug length, automatic movement, 42-hour stated reserve, 100-metre stated water resistance and 20 mm strap interface. The Ginkai-versus-Sumi choice is chiefly a matter of silver or black dial and the distinct seconds-hand treatment. Time+Tide’s article supplies product description and specifications, but not comparative testing, owner-use evidence or independently measured accuracy.
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