Pulled the build sheet from the seat today

yeah, B26 IS November 26...my bad. Its Nov of the year before the model year fyi. So if its a 65, it was born (completed) Nov 26 1964. Also the way you showed us the fender tag is confusing as it doesnt show us what numbers and letters line up with each other (important) try and use * as a place holder ie.:
1234567890
1*3*5*7**0
ABCDEFGHIJKLMNOPQRSTUVWXYZ
2*0*55***11***3*****2*******
etc. Especially down by BDY TRM PNT