Rob, I see light hairlines around the 45-minute-mark on your Pan-Am dial. The feet positions on Seth dials are at the 13 and 45-minute-marks. If there is a third dial foot it will be at the 34-minute-mark.
The Edgemere is one of the lesser named grades, but unlike the Century line can be found in both nickel and two-tone, and in jewel counts from 7 to 17. This fully-jewelled Model 8 was top shelf for the Edgemere:
The Model 4 was the Seth Thomas company's primary keywind movement. Though the Model 2 hunter could occasionally be found with a keyed barrel, the Model 4 was produced in 20 separate runs with a total production of around 12,400 watches.
A very exciting example - a Model 4 from the very first run, and with a gold-plated upper plate. All the serial numbers match on this 7-jewel veteran from the year 1887. Simplicity itself - a barrel, a train, and a balance. No setting gears, no yoke, no lever, and no stem arbor: