Seiko Prospex 1965 Heritage Diver's Watch Save the Ocean Limited Edition
SPB545
- Case
- 40mm
- MSRP
- $1,400
- Movement
- Automatic with manual winding
- Reserve
- 72h
VS
Building 1v1 comparison
Building 1v1 comparison
1v1 Watch Comparison
A focused side-by-side page for specs, fit, movement details, review notes, and enthusiast context.
SPB545
Pair Review
Built from the saved specs and wearability notes for these two watches, then weighed against enthusiast priorities like fit, movement quality, practicality, finishing, value, and collector appeal.
Where it wins
Buyers who want the lower entry price and limited-edition collector appeal
Where it wins
Buyers who prioritize bracelet comfort, refinement, and a more upscale daily-wear experience
The Seiko uses Seiko's automatic, hand-winding Caliber 6R55 with 24 jewels and a stated +25 to -15 seconds/day accuracy claim, which gives it a practical, known-spec movement profile but not a high-precision one. The Longines uses the automatic Caliber L888.5 with a 3.5 Hz / 25,200 vph frequency and 72-hour power reserve, but no accuracy claim is listed. On paper, Longines has the more technically refined movement architecture, while Seiko is more transparent about expected performance. Longines also benefits from the broader technical impression of a modern Swiss diver movement, though serviceability and long-term reliability are not explicitly detailed in the data. Winner: Longines HydroConquest 39mm Black Lacquered Polished
The Seiko is the more compact watch by the numbers: 40.0mm diameter, 13.0mm thickness, and 46.4mm lug-to-lug. The Longines is slightly smaller in diameter at 39mm, but longer and thinner at 48.1mm lug-to-lug and 11.7mm thickness, which changes how it sits on wrist. In practice, the Seiko should feel a bit shorter and more dive-tool compact, while the Longines should wear flatter and more refined despite its longer footprint. The Seiko’s overall wearability note emphasizes modern 1965 Heritage diver proportions with a 40.0mm case, 46.4mm lug-to-lug, 300m water resistance, and an adjustable steel bracelet clasp. The Longines wearability note highlights a notably more versatile, compact-feeling 39mm diver with improved comfort from its tapered bracelet and tool-less micro-adjust clasp. Wrist presence will be more subtle on the Seiko; wrist comfort and perceived polish favor the Longines. Winner: Longines HydroConquest 39mm Black Lacquered Polished
The Seiko offers a sunray-patterned blue dial inspired by Okinawa ocean waters, LumiBrite on hands, indexes, and bezel, sapphire crystal with inner anti-reflective coating, a unidirectional bezel, 300m water resistance, and a secure-lock bracelet clasp with tool-free slide adjuster. That makes it a strong, practical dive watch with excellent functional lume and a more spirited dial. The Longines has a black lacquered polished dial, applied indexes with Swiss Super-LumiNova, sapphire crystal with anti-reflective coating on both sides, a ceramic bezel, 300m water resistance, a tapered steel bracelet, and a double security folding clasp with a tool-less micro-adjust system. It is the more polished and versatile daily wearer, with the ceramic bezel and glossy dial giving it a more upscale, business-friendly character, while the Longines clasp and bracelet details are superior for comfort. The Seiko may feel a touch more characterful and sporty; the Longines is better for all-day, all-occasion practicality. Winner: Longines HydroConquest 39mm Black Lacquered Polished
The Seiko has the lower MSRP at USD 1,400, which makes it the more accessible entry point. Its limited-edition status, serial-number-engraved caseback, and ocean-inspired dial add collector appeal, while the 300m rating, sapphire crystal, and adjustable clasp make it a solid ownership proposition for daily use. The Longines is priced higher at USD 2,200, but the data supports a stronger sense of premium execution through the ceramic bezel, lacquered dial, upgraded bracelet taper, and tool-less micro-adjust clasp. It also carries a more explicitly refined luxury-sport identity in the provided wearability note. From a pure value standpoint, the Seiko wins on upfront cost and limited-edition interest; from a luxury-feel-per-dollar standpoint, the Longines is very compelling. Winner: Seiko Prospex 1965 Heritage Diver's Watch Save the Ocean Limited Edition
Compared
SPB545
L3.779.4.56.6
L3.779.4.56.6