An interesting quest. At one time these were quite uncommon, but findable on eBay. In fact there was a nice one that ran for a year and a half off and on eBay before being sold. I and others held off because of some engraving on the back. In retrospect the price that seemed high then is one that I would jump at today in an instant. Now these seem to be non-existent.
That watch reappeared a few years later and is now in the hands of a dealer from Essex.
Good luck with the hunt.
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