This is a very unusual model, despite the conservative dress watch looks, due to the high end twin quartz movement.  Model reference 9920-7000.

HOW DO WE DATE THIS WATCH?

From the serial number on the case back we can accurately date this watch to being made in December 1979.

CONDITION

Why does a Twin Quartz watch use two crystals?  Seiko launched the Twin Quartz movements in the Grand Quartz and range topping Superior models in 1978, and it is all to do with accuracy.  A quartz crystal can vibrate slightly differently in different temperatures, which affects timekeeping.  The second quartz used in these models effectively regulates the first one for temperature adjustments, meaning the 992* series of movements were accurate to +/- 10 seconds per year.  Even today a regular quartz watch wouldn’t get close to this.

This watch is the rarer version without the calendar.  The dial has scratches on it, and the glass also has a few very light marks.  Everything is working correctly, and we will install a brand new battery before sending the watch out to the new owner.  The leather strap is new, and could be swapped for a different colour if preferred.

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 crown  33.5 mm

Width without crown  32.2 mm

Between lugs  18 mm

Lug to lug length  37.2 mm

Case Thickness  6.3 mm

All sizes are approximate.  The watch is photographed on a wrist of 190mm/7.5 inches and on a wrist of 150mm/6 inches.

Included with this watch is a 2 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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