I knew were Palos Verdes Estates was from spending a little time around San Pedro and Hermosa/Manhattan/Redondo but I was wondering if there was any connection at all to Jeffery in England?
The man at the Gun Library mentioned the little cavity at the base of the bridge just above the bolt release as evidence of a possible "built-up" square bridge, but I think it is just a little nick/dent in the metal and not a void from welding.