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.
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
Without frequent roadside repairs there is no fun in riding!
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