Seiko

1971 Seiko Calculator Chronograph (Ref. 6138-7000)

$ 1,450

This is quite possibly the nerdiest watch out there – and we mean that in the best way. It featured an actual, fully functional slide rule bezel designed for those who needed to do mathematical calculations on the fly. How cool is that? 

Aside from that incredibly unique design, this piece also features the cal. 6138 movement, which was the follow-up to the legendary 6139 and the brand's first dual-register movement.

If you're looking for a watch none of your friends are going to have, this is a great contender.  

SPECS

Stock # PT61387000
Brand Seiko
Style Calculator Chronograph
Model 6138-7000
Serial 1DXXXX
Size Men's
Material Stainless Steel
Dial Black
Millimeters 45
Bracelet Seiko Stainless Steel Bracelet

 

CASE & BRACELET

The large stainless steel case has seen a light polish in the past and retains all of its angles and dimensions. The black Calculator bezel remains full in coloration, shows light signs of use, and retains its original clear plastic secondary bezel. The case retains its original pump pushers and crown. The case back retains all of its original factory markings in crisp condition. It comes supplied on its original stainless steel bracelet, which exhibits light stretch and will fit up to a 7 3/4-inch wrist.

DIAL & HANDS

The matte black dial features metallic grey sub-dials and remains in near-perfect condition, showing no notable damage or signs of age. The original lume markers have aged to a subtle ivory color with no degradation present when inspected under UV light. The original luminous hands match the dial perfectly and exhibit no degradation when inspected under UV light. The orange sub-dial and chronograph hands are also original and add a welcomed pop of color that corresponds to the orange accents within the slide rule bezel.

ACCESSORIES 

None. The watch was recently serviced and is keeping time perfectly, backed by our 1-year warranty on accurate timekeeping.