Originally Posted by
HNSB
It's more likely that it's a GENCO (not GELLCO).
They were a good maker and have a good reputation as shavers.
We don't do valuations / appraisals here, because value is so subjective.
Being is it's and heirloom piece, I suggest you have it cleaned and honed, and shave with it; or at least hang on to it as a piece of family history.