One of the last of the Parker vises?

I picked up this 595A Parker vise at a swap meet this morning. It was day 3 of the event so I figured there was not going to be much left. But one of the sellers had this vise holding some of the specialty tools he had for sale. I asked if the vise was forsale, and surprisingly he said "yes". Aftre a bit of negotiating it was mine. Later when I came back with the vehicle I found a lady attempting to buy it, but he told here it was sold. So I quickly put it in the back of the car and hauled it home.

The vise has 5" wide jaws and is pretty well built. The fit between parts is very good. I estimate it to weight to be about 80+ lbs. Other than the flaking paint the vise is in nice condition.

As you can see in the photos, this is one of the later Union Manufacturing versions of the vise. What I found interesting on it is:

1) There is no cast iron or plate steel retention collar on the screw. The vise uses a large C clip and washer on the inside to retain the screw.

2) The vise has the 595A model number in the casting, not a stick on plate. Or could the plate be missing and all of the Union Manufacturing vises had the model number cast under the plate?

3) The vise uses rectangular shaped jaws, not the C style of the early Parker vises.

4) The main casting does not have a third mounting lug in the back of the vise. On all the photos I have seen with Union made Parker vises, they had three mounting holes in the main casting - even ones with a swivel base.

So is one of the later made ones from the 1960's? Does anyone know when Union Mfg. stopped making Parker vises?

another version 4 sure, gotta be later 1.

@tool_scrounge, Though I’m no expert, I have been doing a very deep dive into the Parker vises lately. I thought that I’d point out that the vise spreadsheet has both this 595A …and a 594 that is posted here [link]. If you’ve not seen the 594 before, you’ll want to compare it. Both reference Parker post Union. Also note the similarities in jaw inserts (including screw attached) and the absence of a spindle saddle. Note that the 594 has a swivel base. I believe that your 595 was intended to have a swivel base also (explaining your question about the absence of the 3rd mounting lug on the fixed/main base.)

p.s., It has been reported that Union sold vises into at least the 1970’s if not 1980‘s.