They dropped the use of the locking screws around 1947 prior to introduce the fully "commercial" M/98 in 1949.
The 640 all have fore end checkering. While it's not impossible the stock was ordered that way, the more likely is that it was removed when the stock was repaired.
Only way to determine the YOM is with SN.
The 640 all have fore end checkering. While it's not impossible the stock was ordered that way, the more likely is that it was removed when the stock was repaired.
Only way to determine the YOM is with SN.