First surprise, it is a Starrett No 86, second surprise, it usually comes with a wood handle to be used as a hand vise. Given its diminutive size, that make sense, but mine did not came with a handle. I bet you it is still out there in the Estate shop, long separated, but somewhere in there :-)
How normally sold as No 86. Cast vise clamp was optional
The complete set
These two pics from Ebay
Instead mine has only a small cast bench bracket to mount on the front or side of your bench overhang
As found, lots of surface rust, nothing too serious, adjustment is a bit rough, but probably due to the rust. Soaking in Evaporust as I type this.
Hum, mine has a much smaller screw and uses a hex key.
No doubt a more modern replacement
Surprise, its a Starrett.
Having no Pat No, it is a more recent one guessing 60s ??
Jaw close tight and have a small notch to hold small rod sizes.
It is pitched as a small hand vise, jeweler vise.
Maximum thickness it would accept is about 2-3/8 inches
And with that screw, min thickness is about 1-3/4 inches.
I can foresee a longer screw in its life...
Took it apart, gave it a soak in Evaporust followed by a quick pass under the wire wheel
Lubricated with WD-40 and reassembled. Works like a charm, I can now spin the handle with one finger, effortlessly, as it should, it is a Starrett.
Lightly deburred the shaft and cylinder in casting.
Just making sure they were no burrs, do not want to change diameter
The Japanning is in good shape.
From that pic I see I need more work inside the jaws,
little bit of rust bloom picked up by flash
That would be a welcome addition to the Hobby room, along with my Panavise
My good old Panavise with the accessory PCB holder.
Used that a lot back in my day fixing TV, VCRs
Bob, who just finished his tool marathon.