What is this?

[tommytools]

I'm just a desk jockey who likes to work on weekend projects so I am not as well versed as I would like to be on identifying tools or what they are used for. Hopefully joining this forum will help fill in some gaps from a whole lot of tools my wife's grandfather left behind. Beginning with this odd looking thing. Can anyone tell me what it is, who's logo is stamped on it and whether or not it's worth keeping? Thank you all in advance.

[Mac53]

Definitely not a bullet molt.

Was he much of a fisherman? It's only a guess, but I'm thinking it is for casting lead sinkers.

[Papaw]

Welcome to Tool Talk!

Looks like a block for a tubing swage tacked on to a pair of locking pliers.

[tommytools]

He wasn't much of a fisherman but he did do a lot of metal work. Perhaps he created this frankenstein tool as part of his work. I appreciate the replies and thank you for the welcome Papaw. I will probably need you guys a lot more as I sift through his cache of tools.

[amertrac]

are the holes tapered on the other side if so it is a nomade flaring block . I can see where it would save some time,   bob w.

[gibsontool]

I don't recall ever seeing a logo like that, can you open the vise grips and send us a few more pics? It looks to me like there is a change in the inside diameter part way thru the bore. The numbers on the block seem strange,No 12 is generally 3/4 of an inch but the hole does not appear to be that big. Can you tell us the bore dimensions? and Welcome to tool talk I am fairly new to the site myself and not very knowledgable on most tools but some of these guys are truly amazing when it comes to some of these unknown items.

[1930]

Not that it really matters and not too split hairs and I am sure Im looking into it further than need be  but tacked on is not quite accurate in my opinion. That is a fine welding job, stitching is even and good penetration. Someone knew how to weld that did that.

I dont however have a clue on its use