Georg Gerlach AG, Berlin (GGCO)

Logos GGCo, in various minor variations, and EPG. The EPG logo relates to the original name of the firm, Electro-Photographische Anstalt Georg Gerlach & Co. There is an article on this firm in issue 29 of The Postcard Album (see refs).

The photographic credit on embossed card 163, "F.M. Cologne", occurs on the cards of several publishers. This card exhibits, in a rather surreal way, the "blueing" or "silvering" of dark areas which can occur on old photos. The photographic credit on card 453, "Gerlach", presumably means Georg himmself took the photo.

At this link there is a large collection of illustrations of GGCo cards, with many of the subjects identified.