Quote Originally Posted by J. Baker View Post
As for the D.O.M. it's likely 1964 with a very slight chance of being an early 1965.
Quote Originally Posted by From the FAQ:
The 1966 version began at 100,000 to avoid problems with parts orders. On December 16, 1968 a new system was started and the first gun was #A001001. All the various rifles and shotguns were numbered sequentially as finished without regard to what they were.

If the serial numbers started at 100,000 in 1966, it had to be built later than that.....