This appears to be a 1957 Pelham based upon tentative attributions to three other watches in the data base on a crystal. No add has turned up yet.
It is a 10KT yellow gold RGP case with a RGP case back with an L7 date code. The movement is a 11AC 17J movement with a L7 date code. The dial has yellow gold applied even hour markers with dots for the odd hours.