REVIEW Seiko 62MAS - Seiko SLA017 - GWF 62MAS
1. History
Original = SEIKO 62MAS = Calibre
62 MAtic
Selfdater.
1965 April-May: 62MAS-10 Small Crown = 6217-8000
January 1966 – June 1967 (and some by end of 1967 until early 1968): 62MAS-10 Big Crown = 6217-8001
Calibre 6217A – 17 Jewels – 18000 Bph – Diashock – Automatic
No handwound – no hacking
Waterproof 150m –Non-srewdown crown
Bezel without clicks
Lug-Lug 46 mm
Lugs 19 mm
Diameter 38.2 mm
Thickness 13,5 mm
Acrylic glass – Lume tritium
Price: 13.000 YEN (in 1967) = 127€ in 2020, BUT:
(1.225,2€ in 1967 …? for re-calculation see:
https://www.inflationtool.com/euro-greece )
2. New SEIKO SLA 017 (Seiko 62MAS remake)
Introduction 2017 - Limited Edition
Calibre Seiko 8L35B (high level calibre) – 26 Jewels – 28800 Bph – Diashock – Automatic
Calibre is based on GrandSeiko 9S55.
Handwound – hacking
Waterproof Diver’s 200 m – Screw down crown
Bezel 120 clicks unidriectional
Lug-Lug 47 mm
Lugs 19 mm
Diameter 39 mm
Thickness 14,1 mm
Domed Sapphire glass – Lume Japanese C3
Price: about 3800€ (in 2017)
3. Heimdallr (GWF) 62 MAS
Calibre Seiko SII NH35A (idem Seiko Cal. 4R35) – 24Jewels – 31600 Bph – Diashock – Automatic
Handwound – hacking
Waterproof Diver’s 300 m – Screw down crown
Bezel 120 clicks unidriectional
Lug-Lug 49 mm
Lugs 20 mm
Diameter 41 mm
Thickness 14 mm
Domed mineral glass Germany AR coating– Lume (Japanese C3 ?)
Price: 168$
info:
https://www.heimdallrr.com/collections/heimdallr-62mas-watch/products/heimdallr-62-mas-mens-diver-automatic-watch?variant=374171896055644. Recognizable differences seen in the pictures:
Remark: Owners who both own SLA017 and GWF or even all 3 can give mor detailed info about the differences. Seize of the battons indexes: The battons from the GWF seem more large, but the metal line around the battons is larger on the 017 then the 62MAS and GWF.
Seize of the bezel: The original bezel 62MAS (and the bezel from the SLA017?) look smaller then the one on the GWF.
Seize of the hands: The hands on the GWF look more large then on the Seiko SLA017.
The date cyphers look a bit more bold on the SEIKO 62MAS vintage.
5. Conclusion:The GWF62MAS is a remake watch that matches VERY well with the original. It looks the same. (apart from the info on the dial)
The case is solid, drilled lugs and stainless steel, as the cover as well. The screwed crown is massive and solid.
The domed crystal is brillant, even when it is not sapphire.
The calibre NH35A is well known and consistently good in quality and performance.
For the money, it is a perfect alternative to the SLA017, what is of course still another (EXPENSIVE) category,
because not everyone can or likes to spend 3800€ for the SLA017, even when it is a Limited Edition.
It is by now, one of my most favorite watches! 
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