I have two of these one with the serial number 021540 which was dated by Walther (back in 1980) as being made in 1957.

I would now like to date my new acquisition which has the serial number 040050.

Short of writing to Walther again (35 years later) anyone know how to date it?

As a passing comment, I have found that I also have a few components of the rear sight (?) so if anyone is lacking something . . . . .