Bill Mains (of Buffalo, NY) often used a small caricature of a Buffalo to mark his work.
Others are just signed 'Mains' or Bill Mains.

Eden NY is just south of Buffalo, NY on Rt62. Buffalo and Eden are in Erie County.
Niagara Falls, NY, is about the same distance but north of Buffalo. NF is in Niagara County, southern part bordering Erie Cty.

Bill engraved for a sport shop named R&R Sports for quite a while. That was located in W.Seneca, NY ,,a suburb just South of the City.
He had some sort of contract with them to do engraving they brought in.
He also engraved for Ithaca and Winchester as an outworker. Colt as well I believe.
He used to appear 'live' on IIRC Thursday evenings @ R&R and engrave while you watch!
Had an engraving bench,etc set up in one corner of the shop.