Tonight, I had a look at the movement, and found a very low serial number (500521). I am not certain that we can actually use the serial numbers to date these watches precisely, but it is interesting that the 18 karat Triple Calendar Chronograph that we have discussed previous was sold in May 1946, and has the serial number 500598 . . . so these two chronographs are 67 numbers apart.

I wonder whether we might be able to find the 66 chronographs between the two numbers!!