the body is stamped "NOV 12", not May, and when a Mosrite stamp says November it must say 1965, because that is the only year Mosrite used stamps in November

The neck is from the 1971-74 era, but in my opinion not a Mark 1 (The Ventures model) neck but made for a Bluesbender or a 350. Look at the neck's heel, asymmetric, hasn't been made for a Ventures model shaped body.
Cheers,
Max