A King Quartz Twin Quartz is quite a mouthful, but this has the same technology as more expensive models. Model reference 9923-5010.
HOW DO WE DATE THIS WATCH?
From the serial number on the case back we can accurately date this watch to being made in March 1979.
CONDITION
The top three sub brands in the 1979 Seiko catalogue were the Superior (up to ¥230,000 , accurate to 5 seconds per year), Grand Quartz (up to ¥150,000 , accurate to 5 seconds per year) and the King Quartz, with this model being accurate to 20 seconds per year and costing ¥57,000. The basics of the movements in each model were very similar, and these 99** series twin quartz movements are still more accurate than most modern movements. One quartz crystal is for the timing, and the second quartz crystal regulates the frequency depending on temperature. The high technology is also fully serviceable. As well as top end accuracy, you also get quick set day and date, with the day being in either English or Kanji. This is all working correctly and we will install a brand new battery before sending the watch out to the new owner. The bracelet is a later Seiko part, number B1424E, but it suits the watch well. Originally model 9923-5010 would have had bracelet part number XQB600. The bracelet that is fitted is quite long but does have some scuffs. The clasp may have been replaced in the past. The bracelet has been cleaned in our ultrasonic bath. There is a small inscription on the case back, something like a post code, but we are not sure what it means.
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 34.6 mm
Width without crown 33.1 mm
Between lugs 20 mm
Lug to lug length 39.9 mm
Case Thickness 8.9 mm
Bracelet will fit a maximum wrist size of 191 mm. The bracelet can be sized for you if you give us your wrist size when placing the order.
All sizes are approximate. The watch is photographed on a wrist of 190mm/7.5 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.
9923-5010