[Herb]

I recall reading somewhere that this a destruction stamping. Something was badly out of tolerance and these parts were to be melted down but a few of them went out in lunchboxes at the end of the shift. If I come across the reference I'll let you know. I have a mismatched Luger with an S/42 reciever # 8005 dated 1937. It has the identical 'X' in the same place. It is my shooter and so far I have had no problems with it. Perhaps when it was made the headspacing was off or something, seems fine now with #79 toggles. I bought it in Jan of 1985.