A friend of mine has an old Glenfield model 25. He says he got it about 10 years ago from a guy who has had it since he was a kid. He gave it some love and brought it back to life and I asked him what year it was made. Looking into it, there was no serial number on it to reference. Not even a sign of one at all. It's in amazing condition, all the stamps and even the light "fire- - - -safe" engraving is easy to read. It's very clearly been manufactured without one but for young guys without much experience in firearms of pre serial number days it's very strange to see something without one. Can anyone give me any insight on this situation?