Mk I Divemaster
Hours, minutes, seconds, elapsed time
Weight 140 g with strap
Water resistance 300 m
Stainless steel, brushed
Diameter 44 mm excluding crown and lugs
Length 52 mm lug-to-lug
Height 14 mm excluding 2 mm crystal
Lug width 24 mm
120-click unidirectional rotatable bezel, stainless steel, with sapphire insert and luminescent markers
Double-domed sapphire crystal with underside anti-reflective coating
Helium escape valve
Solid caseback, stainless steel
Seiko Instruments NH35A (4R35)
Automatic bi-directional winding
Accuracy between -25 to +35 s/ day
Power reserve 40 hrs
Dial & Hands
Matte black dial, sandwich, markers filled with SuperLuminova
Silver color hour and minute hands with SuperLuminova
Silver color second hand, with SuperLuminova
Strap & Accessories
Leather strap, ochre brown, length 125/75mm
Rubber strap, black, length 125/75mm
Screwdriver for strap changes
"I have to say, this watch has a great wrist presence. It has great balance, fantastic proportions and its overall appearance in person is excellent."
"It’s nothing that you or I can see, touch, or hear. It’s Gruppo Gamma’s soul, and that can only be felt by strapping one on."
"But you know I’ve got high end Swiss stuff to compare and contrast with, and I’m going to stick my neck out here and say I think this Divemaster is the finest MB (microbrand) watch I’ve ever seen..."
“Gruppo Gamma has really come up with a good one here. Think this is really good diver.”
－ The Wrist Watch Review
"The quality is top notch. It rivals watches well above this price point... how could you not snatch one of these up?"
- Time To Blog Watches
"I think they did a fantastic job and are well on their way to cementing their own legacy."
- Watch Report