The Titanium Field Guide

Steeldive SD1987S Bronze Big Sub

The Steeldive SD1987S Bronze Big Sub is a 46.5 mm bronze dive watch with an NH35 automatic movement. Rated to 2,000 m, it goes deeper than 96% of the 198 bronze dive watches in the guide. At 46.5 mm across, it is larger than 90% of the 203 bronze dive watches in the guide.

All Steeldive watchesDiver watchesMicrobrand
Material
Bronze
Grade / type
CuSn8 marine bronze
Water resistance
2000 m
Type
Diver
Price
– · No list price published; the maker store currently shows a reduced promotional figure on this listing, so no price is recorded
Case diameter
46.5 mm
Thickness
16.4 mm
Lug-to-lug
55 mm
Origin
China
Movement
Japan NH35 automatic
Caliber
NH35
Power reserve
41 hours
Complications
Date
Construction
Assembled
Finish technology
Natural finish
Caseback
Steel
Nickel-free
No (steel contact)
Bracelet / strap
Orange rubber strap
Crystal
Sapphire with AR coating
Display back
No
Dial
White with orange markers
Dial colours
White
Lume
Swiss C3 Super-LumiNova
Availability
Offered
Status
Current
Not published
Reference, Weight, Colour, Hardness, Surface treatment, Matching bracelet
High confidence Verified Oct 2026 Source: Steeldive (maker store)
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Frequently asked questions

Is the Steeldive SD1987S Bronze Big Sub nickel-free?

No. The caseback is steel, and steel carries nickel, so the guide does not list it as nickel-free.

What is the case of the Steeldive SD1987S Bronze Big Sub made of?

The case is cusn8 marine bronze. That is confirmed against the maker's specification. The caseback is steel, not titanium.

What size is the Steeldive SD1987S Bronze Big Sub?

The case is 46.5 mm across, 16.4 mm thick and 55 mm from lug to lug. It is water resistant to 2,000 m.

How much does the Steeldive SD1987S Bronze Big Sub cost, and is it available?

It is in production, but the maker does not publish a price.

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