Took the words right out of my mouth! Thanks everyone!I,m always amazed how much detailed information and knowledge is out there --Great info!
I suspect you will find the badge screw holes were filled in prior to painting the tank. The only BSA that came with that tank was the 1973 BSA T65T. I could be wrong but I dont think so.I have a breadbox tank without the seam, but it does not have screw holes for the badges. I believe it's a tank from BSA.
Your not going to find a top seam your tank as it is a late 77 (really78) to 81 UK tank. The seam tank with trim strips was introduced in late 1971 and then used on 72's. In 73 the seam was removed but the shape stayed the same. In late 77 the petcocks were moved forward but that was the only change. that tank stayed in use through 1981.That has a top seam, and all that I've seen have a seam there.
I looked under the bolt on the top, and also removed the gas cap and felt under there and put a mirror under there.....
NO SEAM down the middle on the top!
Am I reading into this too much, got a friend in the same state that by chance says it's probably an 82-83 tank? Were those logos screw in? I'm about to shine a flashlight into the tank to see what the single screw says behind it.