Category Archives for Calculator

Seiko Calculator Watch C153-5011

Seiko Calculator C153-5011

Calculator On The Wrist

Digital ➕➖✖️➗ Saturday!

In the mid seventies, pocket sized calculators had hit the market for just a few years and gained some popularity.  Brands like Casio, Texas Instruments, Sharp, Panasonic etc. were selling those calcs like hotcakes.  In a different category, Pulsar (before being acquired by Seiko) and HP also had their own inventions, have a calculator built inside a watch, with an LED display.  However, they were very very pricey.

Then in 1976, Seiko came out their first calculator watch, C153, with the use of LCD as the display. The chunky and robust watch case is a signature of their early digital watches, mounted with a 22mm wide solid link bracelet, this legendary calculator watch is no featherweight. It's history, a must have for any vintage digital lover. Mine is from 1977 and came with the original Z-clasp version for the bracelet, an important member of my 'Seiko's First' collection.

Seiko C153 advertisement 1
Seiko Calculator C153-5011



Seiko C153 advertisement 2
Seiko C153 Advertisement 3

Pulsar Calculator Watch Y739-5019

Pulsar Y739-5019
Pulsar Y739-5019

Digital Saturday, woohoo!!

A proud owner of this gorgeous Seiko Pulsar calculator, from 1979. Fully functional, perfect keyboard response, with the signature stylus-in-the-clasp, thanks to the previous owner in keeping it nice. All I have done was some careful cleaning of the keyboard and vents under of a watchmaker loupe, plus a light polish to get rid of most fine lines, ultrasonic-cleaned the bracelet and light brushing to restore its finish the best I can. Man, I love it, it's my first Pulsar too.

Special thanks to Seth, for helping me in acquiring it. It is finally on my wrist, you're the man!