Hi John and welcome to the forum.

Identifying your bike will not be too much of an issue if you can post a series of photos of it.

The thumbnail is simply too small to work with.

There will be a thread here somewhere if you are having trouble, you normally require the image details from a Photobucket account or similar.

From the thumbnail the bike appears to have 1967/1968 parts and features. It may have an earlier engine fitted for that A50B number.
The later frames had the frame number down by the left front engine mount. I would expect to see yours there and possibly on a flattened boss.

Hello Kevin, I will post a better picture of my bike. It has matching engine and frame numbers. Thanks Have a Great Day

John: The best I can find shows the engines with a A50B prefix came in both 1964 and 1965. As for the 6368 number you posted, A50B frames start with #4001 in 1965 so the year could be 1965.

However an A50 engine is a 500cc machine while a Thunderbolt is a 650cc machine and should have an A65 engine number.

From what I can make out in the small photo is there is a lot of detail from a machine later than 1965.

Gordo