Oh yes! Great picture of a very interesting serial number.

Definitely not 1967.
Any chance you have the frame with a matching number?

Kevin had a picture of an engine with a similar case style, A65TA 12215Y.
The bike with your engine coming off the line in December of 1969 as a 1970 model does make sense based on the case style.
The 1900 number is odd, at that point in time it would normally be represented as 01900.
Seems like the guy doing the stampings may have gotten momentarily confused as to whether this one was to be a 1970, or a 1970 with a number that made it look like it was a 1967.
I'm looking forward to reading Kevin's take on this one.

Last edited by Two Alpha; 02/08/12 5:21 pm. Reason: tweeked a little