Missing Something :

Not pushing the point, but look again. The date should be on top of magazine right under the barrel. It was very difficult to find on my weapon. I guess I looked for it about 45 minutes. I had to hold the light at differnt angles. I also cut the lights out in my shop and the darkness helped me focus on that area. Since I found my date I have looked at two other "97s and found the date for their owners.
Info. I have,according to your serial nbr., indicates a possible build date between 1940-1941. Hope you find it.

john