Thank you Aaron. I rather assume the stock is from a 1937 Oberndorf, I wish the block would be visible at the bottom of the serial number.
Sn 7588 g
Under buttplate 1 4 40 Kr
"P" under stock grip
That is week, not month. So for mine it was the 7th day of the 50th week of 1939. I'm thinking yours is possible 48 as there's obviously no 78th week in a year. German 1 looks very much like a 7 but that's early in 1940 to be on a '41 I'd think.What month is "50"? I have a byf41 with a date code 3 78 40.