ID my vise

[birdshot]

I bought this vise from an antique store yesterday. I could not find any markings on the vise other than 441A and 441B. It is a small home shop vise with 3.5 inch jaws and opens to about 4.5 inches. It seems to be very well made and has an unique mounting. From the center of the bottom plate a 1/2 inch stud protruds about 3 inches with a large wing nut. I mounted the vise and can easily swivel it by loosening the wing nut. It also has to side slots for 3/8 inch bolts. I am hoping someone could tell me what I have. Thanks.

 

[Outlawmws]

The Dynamic and Static jaws look similar to my Erie Tool Works Vise, other than the raised boss at the "mounting holes" I suspect your vise had it's swivel base broken and tossed and the wing nut estrangement was in it's place.

Whet is unusual on your vise is the rounded main screw head. you usually see those on older machinists vises.

 

[birdshot]

Thanks for looking. I do believe it to be a vintage vise, even if it is not worth much, I would like to know more about it as I find tool history to be interesting.