Dear Curious Spud-ly member,
That's definitely the square and compass. I couldn't tell you right now if it predates masonry, is a spin-off, or something that borrowed the same symbols.
I'm not incredibly well versed in some of the history of the fraternity yet and unfortunately life has gotten busy enough that I haven't been able to devote much time to learning more.
I'll show that picture to a couple of brothers I know who have devoted a lot of time to learning the history and get back with you on that.
A now also curious member