Here is one I picked up recently. Based on the newpaper ads on this site in the 1930 to 1939 thread - this model that was previously the President Madison became the Tyler and was upgraded with to a 21j movement.
My movement is marked 21j - 6 adjustments. It does not have a serial number, date stamp or country of origin.
Dial numbers are black enamel. The work is very good - but I am assuming that this was done over a Radium dial and the hands were swapped at the same time. However, the finish is good enough that it could be factory and the hand look appropriate to the time.
The case is 14kt GF...Marked with the 1927 patent date. BTW: the case is hinged but missing the hinge pin.