So you are saying it doesn't have a "K" at the front of the serial number on the bottom of the grip?
If there is a K, then it was made in 1948. If it was a Masterpiece and 1940-41 and didn't have K, it would be in the range of 682420 to 696952. Or the K-22 Outdoorsman from 1931 to 1940, 632132 to 682419. As you can see, those numbers are all longer.
Gregg