Thanks everyone!
KC it was bought with a Paul's Safety Bottle & Ink Co. inkwell 1880-1933, of which the only other one which I found of that exact kind was excavated & belongs to a Historical Society; also with a short Heinz bottle that also looks turn of the century but I'm waiting for Heinz to get back to me...they couldn't find it in their catalogues and a kind Heinz employee is sending photos of it to their archivist for identification. I'm thinking this bottle was saved for a reason, too...
I will look thru that site with glassware markings, thank u...I have looked through a lot of them already (on other sites) and my eyeballs are starting to twitch but I don't want to give up yet!
Excelsior...that seems promising, thank you! I am trying to find any pictures of the Excelsior logo but so far have only found descriptions that do match this logo as far as descriptions go.