Hello rob,

Have an gearbox that came of on an big4 wd .
There is only an sn on it 43623 can you date an gearbox on it,s sn ???

Marcel,

Unfortunately, assembly books for many machine not existing anymore.
SN43623 most likely made in 1940 based on numbers known for Oct 1939 and Sept 1940.

Cheers,

Rob

Ok thanks for the info rob.