Am considering purchasing a Gruen Skeleton watch with black dial. (On Ebay as auction # 707229968), but the seller is offering to sell me one offline "when it gets in from Switzerland".

The back of the watch pictured has Gruen Swiss Since 1874, then GSM052, a circled 269, and 1069 underneath that. It says Battery 321 and Swiss Movt 6 Jewels as well.