Everyone remembers the Seiko calculator watches, but when was the last time you saw one?  Model reference C153-5011.

HOW DO WE DATE THIS WATCH?

From the serial number on the case back movement we can accurately date this watch to being made in September 1978.

CONDITION

The first calculator watch from Seiko used the same C153 module (that was the C153-5007), and this was hot on its heels.  Both were launched in 1977, so this is an early one.  Happily we have found a copy of the original instruction book from this site here.  Using the calculator requires a steady hand and a cocktail stick, so for all intents and purposes it is an impractical design!  But practicality and how good something looks are not always hand in hand.  The watch is very original, with the correct Z145 bracelet (which requires no special tools to adjust and should fit most wrists).  The light still works too, which is usually the first thing to fail on vintage LCD watches.  The glass has a few light scratches, but it is far better than most.  Everything seems to function correctly.  We will install a brand new battery before sending the watch out to the new owner.  The bracelet has been cleaned in our ultrasonic bath.

This watch will be supplied with our branded presentation box and our Certificate of Authenticity.

Please see the HD video for more detail.  All photos and videos are part of the description and are of the actual watch unless mentioned.  We do not photoshop any pictures, and the images are copyright of birthyearwatches.com and should not be used without permission.

​SIZE

Width with pushers  36.1 mm

Width without pushers  35.4 mm

Between lugs  22 mm

Lug to lug length  42.3 mm

Case Thickness  11.4 mm

Bracelet will fit a maximum wrist size of 205 mm

All sizes are approximate.  The watch is photographed on a wrist of 190mm/7.5 inches.

Included with this watch is a 3 month guarantee and free delivery to UK addresses.  If you live outside the UK we can still deliver to most countries.  Please see our Worldwide Shipping information, or Contact Us.   Payment can be made by most credit or debit cards, bank transfer or PayPal.

From 1st September 2021 we will be planting a tree for every watch we sell, working with the International Tree Foundation (Est 1922) to make this business positive on carbon.  By buying anything pre owned you are effectively reusing what already exists, but this takes it further and makes us feel good.

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