Because of the unevenness of the number spacing, it would be my OPINION, that this "1920" is a property mark on an otherwise non-dated receiver...
I would be interested to know how others feel about this theory...
I can't say that I have ever seen a "date" stamp with number spacing so carelessly applied, but a large number of the "property" stamps for what are incorrectly called "double-dates" Lugers do exhibit this workmanship.
...Sort of like the difference on how cars assembled in the middle of the week seem to be carefully made and most of the lemons are produced on Mondays and Fridays...
