Selling this for my Dad – he found it in an old barn in upstate NY.
I don't see any brand markings on it, but, as you can see from the photos, the hook functions (opens / closes) and is complete, meaning it includes the pin as well as four bolts with washers and nuts.
Btw, the hook works and I didn't even have to oil or grease it up... which might not be a bad idea if you intend to actually use it.
Not at all sure if it's actually 'vintage' or it's just rusty, which is nothing a fresh coat of paint cannot fix!