Hi All,
For what it's worth, I've seen this Senator model with the 8AC,8AE,8AD,8AH and now I have one with the 7AP movement. So I think this could relate to the different years this was produced.
IE, the 7Ap and 8AE models I have are both dated 1942, the 8AH is dated 1945, and an 8AD dated for 1949. I have also seen this movement stamped with both, J9 and 49 togeteher so I am pretty certain that it's for 1949.
Now if you look at the 8AE in the Senator Wayne bought off me it has 3 date stamps, for 1941,1942 and 1943. Now try figuring that one out!! Something like that is very rarely seen and in retrospect I think I should have kept that one and sold one of my others with a single date code.
For what it's worth Wayne, hold onto that one because I really do believe it's very rare, like a misprinted stamp. Enjoy