On Holden’s list, Almost Favorites
Seiko Prospex Marinemaster SLA077
The Seiko Prospex Marinemaster SLA077 (SLA077J1) is a dive watch from Seiko: a 42.6 mm stainless steel with hard coating case, 13.4 mm thick and 49.3 mm lug to lug, with an automatic 8L35 movement and 300 m water resistance.
Going by its 49.3 mm lug to lug, it should sit within the flat top of a wrist of about 6.7 inches (17.0 cm) or larger.
Research found it at $2,900 list in the US (checked August 2026).
Specifications
From the research, with the sources for each group of facts. Unknown means no source confirmed it.
| The watch [1][2][3] | |
|---|---|
| Brand | Seiko |
| Reference | SLA077J1 |
| Category | Diver |
| Production | Current (introduced 2024) |
| Case and size [1][2][3] | |
| Case diameter | 42.6 mm |
| Lug to lug | 49.3 mm |
| Thickness | 13.4 mm |
| Lug width | 20 mm |
| Case material | Stainless steel with hard coating (Monochrome states hard coating; official page lists stainless steel) |
| Crystal | Dual-curved sapphire crystal, anti-reflective coating on inner surface |
| Water resistance | 300 m / 1000 ft diver's |
| Weight | 196 g |
| Movement [1][2][3] | |
| Movement | 8L35, automatic |
| Power reserve | Approx. 50 hours |
| Accuracy | +15 to -10 seconds per day (official) |
| Bracelet [1][2][3] | |
| Bracelet or strap | Stainless steel bracelet with diving extension; Monochrome describes three-link, Time+Tide describes a five-piece link (three broad brushed + two narrow… |
| Clasp | Three-fold clasp with secure lock, push-button release and diver's extender; twin-trigger release per Time+Tide |
| Price and warranty (US) [1][2][3] | |
| List price (US) | $2,900 (official US site, accessed 2026-08-26) |
| Street price (US) | Unknown |
| Used price (US) | Unknown |
| Warranty | Unknown |
Will it fit?
A watch wears comfortably when its lugs stay on the flat top of the wrist. Here is the 49.3 mm lug to lug against the flat top estimated for common wrist sizes.
| Wrist | Flat top | Fit |
|---|---|---|
| 6 in 15.2 cm | 47 mm | Likely overhangs |
| 6.5 in 16.5 cm | 51 mm | At the edge |
| 7 in 17.8 cm | 55 mm | Comfortable |
| 7.5 in 19.1 cm | 59 mm | Comfortable |
| 8 in 20.3 cm | 63 mm | Comfortable |
Check it against your own wrist An estimate, not a guarantee; how the method works is on the tool page.
What the research found
These are the research’s judgments, scored against Holden’s priorities, not his own words.
Strengths
- Genuine flagship-line execution: dual-curved sapphire, pebbled matte dial, premium 8L35 with tighter +15/-10 spec
- Direct lineage to Seiko's 1968 300 m hi-beat diver — real heritage, not marketing
- 13.4 mm is slender for a 300 m diver; sloped camber aids wear
- Clasp with secure lock, extender, and four-position micro-adjust
- White matte dial is distinctive in a sea of black divers
Weaknesses
- 4:30 angled date window is widely criticized
- Unsigned crown at $2,900 noted by commenters
- 8L35 lacks the hi-beat spec of the 1968 original it honors
- 196 g and 49.3 mm lug-to-lug demand a larger wrist
- Factory-only service path for the 8L
Research scores, 0 to 10
| Execution and feel in the hand | 8.7 |
|---|---|
| Design identity | 8.2 |
| Value at a realistic price | 7.0 |
| Long-term ownership | 8.5 |
| Movement and engineering | 7.6 |
| Wearability and proportions | 6.3 |
| Versatility and durability | 7.0 |
| Fit with Holden's collection | 7.4 |
Also on Holden’s list
Other diver watches on his list.
- Tudor Pelagos LHD 25610TNL-0001
- Grand Seiko Spring Drive U.F.A. Ushio 300 Diver SLGB023
- Rolex Submariner 124060
- Traser P67 Diver Blue 109375
- Squale 1545 Grey 1545GG.AC
Sources
- Seiko SLA077J1 — official product page seikowatches.com · read August 26, 2026
- Introducing: Seiko Marinemaster SLA077 and SLA079 monochrome-watches.com · read August 26, 2026
- Seiko Prospex Marinemaster SLA077 & SLA079 | Hands On (Zach Blass) timeandtidewatches.com · read August 26, 2026
Personal research, not a source of truth. Spotted an error? Email a correction.