Who's trademark is this?

Hi everyone,

William here. This is my first thread. I've been interesed in the world of purses for about the last year. Some brands I'm familiar with, some are new to me, and some I can't figure out at all. Currently, I have a bag, I think it's a shoulder bag, but I'm really not sure. For the life of me I can't identity who the maker was. The logo seems to have a G and then right beside that, it looks like a picture of a bison or buffalo. The bag is exemplary, the leather is very high quality, as are the brass fittings. Does anyone have any ideas?