Seiko 62MAS: the 1965 original vs the SPB143 and SPB453

	6217-8000 / 8001 (1965)	SPB143 (2020)	SPB453 (2024)
Diameter	37 to 38.2 mm, depending on the source	40.5 mm	40.0 mm
Thickness and lug to lug	Not documented by Seiko	13.2 mm, 47.6 mm	13.0 mm, 46.4 mm
Lug width	19 mm	20 mm	20 mm
Movement	6217A automatic, 17 jewels, 18,000 vph	6R35 automatic, 24 jewels, 21,600 vph, about 70 hours	6R55 automatic, 24 jewels, 21,600 vph, about 72 hours
Hacking and hand-winding	Neither	Both	Both
Water resistance	150 m when new	200 m	300 m
Crystal	Acrylic	Curved sapphire	Curved sapphire
Seiko USA list price, Oct 2026	Not applicable	No longer listed	$1,300

Original specs from The Seiko Guy, Fratello and Ikigai; modern specs from Seiko’s product pages and 2024 press release.

The original is the smallest of the three. Published diameters run from 37 mm to 38.2 mm, and Seiko itself put the 1965 diameter at 38 mm when it made the SJE093 re-creation. The SPB143 is 2.5 mm wider at 40.5 mm. The SPB451 and SPB453 trimmed that to 40.0 mm and 13.0 mm thick, with a shorter 46.4 mm lug to lug, so they sit closer to the original than the SPB143 did.

The details differ too. The original has an acrylic crystal and a bezel that turns both ways without clicks; the modern watches have sapphire and a click bezel.

We’ll add the original’s sold range after our first sampling of eBay sales in November 2026, split by crown version and condition. On the modern side, Seiko USA listed the SPB451 and SPB453 at $1,300 in October 2026. The SPB143 is no longer in its catalog, so expect to find it pre-owned or as remaining dealer stock.

It’s Seiko’s first diver, the one Seiko Museum calls Japan’s first 150 m water-resistant watch. The risk is what’s been changed in 60 years. Replaced crowns, relumed dials and swapped case backs all turn up, and the small-crown 6217-8000 was only made for a few months, so check its crown, tube and case closely. Read our 62MAS buying checks before you pay, and budget for a service by an independent watchmaker.

A new SPB451 or SPB453 is rated to 300 m, has a sapphire crystal and a movement that hacks, hand-winds and runs about three days, and Seiko services it. You get the 62MAS shape without the risks of a 60-year-old diver.

• SLA017 (2017): Seiko’s first re-creation, 39.9 mm, with the 8L35 movement; 2,000 pieces.
• SJE093 (2023): a second re-creation at the original’s 38.0 mm diameter, with the slim 6L37 movement.
• SJE117 and SJE119 (2024): the Marinemaster 1965 Heritage line, 39.5 mm, 6L37, $2,800 at Seiko USA in October 2026.