Omega Electroquartz F8192hz "Beta 21" - Works, but runs slow

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Hi everybody, in the end I decided to put the watch on Ebay. It's a rare Omega Electroquartz F8192Hz with the famous movement CEH "Beta 21", also known as Omega 1300, the very first quartz wristwatch ever made. The watch works but runs slow. In fair conditions considering the age, the watch sets properly and the calendar changes instantly at midnight. Unfortunately after a battery change it decided to lose one minute per day, so it's sold for service or a project watch. It's been good while it lasted!

Here's the auction link. Grab it before someone else steals it from you!

http://www.ebay.ie/itm/172533558245?ssP ... 1555.l2649