[cashflyer]

I'm sure you know that the 4503 is the movement model.

Stolen from a clock website:
There should be another number on the movement that is a month and year, indicating when it was made. Pre-1931 is a Seth Thomas movement. 1931 and later would be a General Time movement.

The Plymouth Clock Co. was a division of the Seth Thomas Clock Co. It made a line of less expensive clocks, many of which were tambours.