Heres another whats it and whos it?

[lebaron]

Looks like a seamer but it has that lip on it. Name looks like SHANNON HILADA

[bill300d]

Looks like some sort of stretcher if that clamp thing tightens up when you pull on the strap or bar.
I've got nothing on the name.

[Northwoods]

For stretching leather or upholstery.

[Lewill2]

Several listings for Shannon located in Philadelphia, 2 of the listings are for hardware dealers and one is a Cutlery maker. Other listings for Shannon without a town/city listing. These are listed in EAIA Directory of American Toolmakers. Philada was a common abbreviation of Philadelphia.

[lebaron]

I like the idea of it being a leather stretcher. I would assume the spike goes into the ground and the clamp does tighten when you pill on the strap. J.B. Shannon was a hardware dealer in Philly in the 1800's. And yes, Philada was common shortcut for Disston tools back then.