I just picked up a nice looking Waltham 645 21J.
The dial looks very simple montgomery, I havent seen these before are they common? any name/style?.
Thanks

p2

p3

My book says it is a Model 1908 - adjsuted to temperature, isochronism and 5 positions, double roller, steel escape wheel, fine ruby and sapphire jewels. Orginally sold for $40.00. This watch has quite a "wow" factor. Incredible.

Chris, you have a very nice watch. I have an 845 that has the same dial. I wonder if it was a special dial on the numbered watches? ie 645, 845