THIS octant that i found online is very VERY similar to Geoff's.

http://www.freewebs.com/ebayalbum/index.htm

I suspect that Geoff's Octant was made prior to 1800 but am not sure ... I could be wrong.

KEYWORD: ANCHOR symbol. (that's the closest we have to be able to ID this octant ... no names/signatures/symbols anywhere else on it. It is ebony, brass, and I believe ivory.

Thanks everyone.