Watch the dating guy
Both companies went to a different serial number system and the date of manufacture is not determinable by these letter & number serials.
Write this number down and compare it to the charts on this website.
This will give a good idea of the manufacture date.
Note the thick hands, engraved patterns and bold design of all of these watches.
These watches are typical of the "Deco" style of the teens and 20's.
By the late 1930's mens watches were more masculine. This was made possible by the advent of square movements.