Steeldive · Factory brand · China
Steeldive SD1975 Tuna
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- Seiko NH35A
- 47.5 mm × 15 mm
- Sapphire crystal
- 300 m water resistance
Where to buy
- SteeldiveWorldwide
Movement
- Caliber
- Seiko NH35A
- Type
- Automatic
- Tier
- Entry
- Complications
- Date
- Frequency
- 21,600 bph
- Power reserve
- 41 h
- Hacking
- Yes
- Accuracy (factory)
- -20 / +40 s/day
Case
- Diameter
- 47.5 mm
- Lug to lug
- 44 mm
- Thickness
- 15 mm
- Lug width
- 22 mm
- Material
- Steel
- Hardening
- —
- Water resistance
- 300 m
- Crown
- —
- Case back
- —
- Bezel
- Unidirectional, 120 clicks, steel insert
Crystal & dial
- Crystal
- Sapphire
- Shape
- —
- Anti-reflective
- Yes (side not stated)
- Lume
- Swiss luminous (grade not stated)
Bracelet
- Bracelet
- —
Weight
- Head only
- 98 g
- On bracelet
- —
- On strap
- 121 g
Prices
| Variant | Configuration | Type | Price | USD | As of | Source |
|---|---|---|---|---|---|---|
| All | — | Street | 149 USD | $149 | 2026-10-20 | link |
Variants
| Name | Dial | Configuration |
|---|---|---|
| Black | — | 3-link or 5-link bracelet |
| Green | green | 3-link or 5-link bracelet |
| Blue | blue | 3-link or 5-link bracelet |
| Red | — | 3-link or 5-link bracelet |
| Yellow | — | 3-link or 5-link bracelet |
| Orange | — | 3-link or 5-link bracelet |
| Turquoise | — | 3-link or 5-link bracelet |
| White | — | 3-link or 5-link bracelet |
About this entry
80% of key specs known. Missing: hardening, crown, bracelet offered.
Tuna-can (shrouded) diver in the style of Seiko's Tuna. Brand specs from the SD1975C listing: stainless steel (grade not stated), 47.5mm case, 44mm "case length" (the lugs sit under the shroud, so the length is shorter than the diameter), 15mm thick, 22mm strap, sapphire with AR coating (side not stated), steel unidirectional 120-click bezel, "Swiss luminous" lume, 300m, 98g without strap and 121g on the rubber strap. Sold with a 3-link or 5-link steel bracelet (style codes 75C-BL-03L / 75C-BL-05L, same price); bracelet construction and clasp are not described. Crown and caseback type are not stated. Colour names are the store's options; whether they refer to dial or bezel is not stated except Green and Blue. Other SD1975 versions on the official store include the SD1975N white dial ($143), SD1975B white bezel ($139.90), SD1975K black on tank bracelet ($209) and SD1975S bronze.
Last verified: 2026-10-20. Edit or correct this entry.
Sources
- Steeldive official store, SD1975C Blue tuna accessed 2026-10-20
- Steeldive official store, Diver series (other SD1975 versions) accessed 2026-10-20
- OzBargain, Steeldive SD1975 (NH35, sapphire, 300m) deal on AliExpress (Jun 2024) accessed 2026-10-20