A stainless steel cased LCD Chronogrpah from the best in the business, Seiko. Model reference A158-5050 or DHZ018


From the serial number on the case back we can accurately date this watch to being made in October 1978. This was the launch year for the A158 movement.


Seiko were at the cutting edge of everything in the 1970’s. They were the first to launch a quartz regulated watch on 26th December 1969, and then pioneered high precision quartz movements, making even their Grand Seiko mechanical watches redundant in the process. And in 1973 they launched the world’s first six digit LCD watch, followed in 1975 by the world’s first multifunction LCD watch. Then in 1978 the A158 module was launched, which would be a chronograph, full calendar, alarm and had a light too. The instruction book for this movement can be found online here, and all functions have been tested and are working – even the light. The glass has only light scratches. The bracelet has been cleaned in our ultrasonic bath. We will install a brand new battery before sending the watch out to the new owner and set the watch up to their timezone.

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.


Width with crown 34.7 mm

Width without crown 34.7 mm

Between lugs 19 mm

Lug to lug length 39.5 mm

Case Thickness 9.8 mm

Bracelet will fit a maximum wrist size of 230 mm. The bracelet can be sized for you if you give us your wrist size when placing the order, but doesn’t require any special tools to adjust at home for perfect comfort.

All sizes are approximate.

Included with this watch is a 1 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.

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