Stilly, Remove the bolt and look on the side for an engraved date of manufacture. My bolt has 8/20/55 on it. If you have not removed the bolt, all you do is to hold back on the trigger and slide the bolt back and out. Hold the trigger to replace the bolt.Stilly said:I have only owned my 75T for about a month. I came across mine at a gun show. I bought it because of the price, quality, reputation, and the peep sights. I believe mine was made (serial number) in 1950, but it has 54 stamping. Don't know if that means anything ? I have been hunting for other interested 75 owners. Congradulations on finding a great rifle. I've been watching GunAmerica Gun Classifieds, not too many show up.