Warmtoast.
In the early sixties, 1963 IIRC, the nav plotter on my Valiant crew, who had previously been on a Canberra tour at Tengah, sold me a Rolex for £35. I, being a mere co-pilot, believed his sales pitch and acquired what I thought was a bargain.
His time in the RAF then came to an end and he disappeared into the depths of Gosport.
The watch then stopped and innocently I took it along to the local high class jewellers for them to take a look at it. Their merriment was quite embarrassing.
I then had to crawl back to Flying Clothing Stores to draw back the aircrew watch that I had boasted that I would not need anymore.