01-02-2021, 10:28 AM
M79673 would be from around March 1929.
The simple way to find out is to look at the A7CA chassis register http://a7ca.org/chassis-register/ . Original engine numbers tend to run ahead ahead of chassis numbers - a difference of a couple of thousand by the end of production - but it's not hard and fast. For example, I know for certain that my '33 RP has its original engine, which is numbered about 200 below the chassis.
The simple way to find out is to look at the A7CA chassis register http://a7ca.org/chassis-register/ . Original engine numbers tend to run ahead ahead of chassis numbers - a difference of a couple of thousand by the end of production - but it's not hard and fast. For example, I know for certain that my '33 RP has its original engine, which is numbered about 200 below the chassis.