Reference guide
Seiko references
10 Seiko references, each one built from what Seiko itself publishes about that reference — case, movement, water resistance, bracelet — with what a dealer should check before buying one.
Where Seiko states nothing, these pages say so rather than filling the gap. Last reviewed 2026-09-22.
Astron
Presage Cocktail Time
Presage Sharp Edged Series
Prospex Land
Prospex LX line
Prospex Sea
- 1970 Heritage Diver's Black Series Limited Edition, 8L35SLA061J1The 8L35 is held to a much tighter published tolerance than the 6R calibres, and it holds fifty hours rather than seventy. Different movement family, different expectations.Specifications
- Prospex Diver 200m, 6R35, silicone bandSPB317J1A hundred grams on a silicone band, which is what makes it wearable. The band is also the component with the shortest life, and it is the one nobody inspects.Specifications
- 1965 Heritage Diver's Watch, 6R55, 300mSPB453J1Rated 300m diver's, which is a different claim from 30 bar. Seiko uses both forms of words across its range and the distinction is worth explaining to a buyer.Specifications
Seiko 5 Sports, SKX series
- 5 Sports DENHAM Limited Edition, 4R36, nylon strapSBSA281A day and a date, not just a date — the 4R36 differs from the 4R34 in what it displays. Plus a nylon strap, which is the cheapest part and the first to look tired.Specifications
- 5 Sports SKX series GMT, 4R34, HardlexSSK001Hardlex, not sapphire — which scratches instead of chipping and polishes out. Knowing the difference changes how you grade the crystal and what you promise about it.Specifications
Not affiliated with Seiko. Specifications are read from the manufacturer's own published documentation on the date shown on each page and may change; the manufacturer's current documentation governs.