My question is, I have several old Triumphs, 1971, 72 and a couple of frames in the late sixties. I've got one that decodes to a 1977 (EP83068). Unlike the other frames the VIN does not contain the 4 digits that indicate the motor model as part of the VIN. I would expect it to be T140VEP83068 or something similar but it isn't. Is this normal for 1977? Has someone tampered with it? Or did Triumph leave it off that year? Any help would be totally appreciated!!! P.S. I do not have the original motor for the frame. I put a 1971 T120RV in it which was quite a chore since they changed the brake and shifter in 1975!!! But I made it work and it's a pretty sweet bike after many hundreds of hours of work. I'm working on getting a VIN check so I can get it tagged. I googled extensively but could not find the answer. Thank you.