If it was made in 1949 or later, it should have a small oval ring with numbers and a letter inside it. Small, maybe 3/8" long, probably very faint, and located I-don't-know-where on a 340/325. It is a combination inspection/date code, the letter of which will tell what year it was made. Look for it and report back, and we can tell you it's birth date (or close). (A=1949, B=1950, etc. They skipped some letters, but not 'til long after when you think it was made.) Pre-1949, you're SOL.
Last edited by gnoahhh; 07/15/11.
