My 3" Woden seems pretty similar:
The differences are in the rear jaw/body, as with the standard, (or what I've come to class as standard), Record No.(1-9) styling. Straight back, defined bracing and distinctive base shape. The grey vice deviates on those areas. Only seen that styling on same type ones upto just. There never seems to be a makers name on them, only the RD number and a No.(1-9). They always seem to be described as old Records when I see them, (usually referred to as being out of grandad's shed or similar), but I've not found out what the specific definition of old is in this case, as of yet. That could mean anything from when Record first started up until around the early 70's, knowing what people are like for classing anything above 25 or so years as (old|vintage|antique).
Here's a Paramo No. 6. Looks horrible in the picture but works fine. The styling is somewhat different.
That does seem closer in styling though. Base shape is similar, and it has a not perfectly straight back on the body.
Fretters: nice color on the Swinden vice. curious how the linseed oil under it is affecting the paint? also thanks for showing the vice nut in place and does it need a screw or something from the top to hold it in place or does it just work like that once the main screw is inside it?
It's the old Parkinson wood vice which suffered the oil treatment. Hopefully, I should be giving that a quick test within the next few days, to see how well it has bonded, (if I can bear the thought of attempting to scrape an inconspicuous area on a perfectly functional paint job, that is

). I'll be taking some photo's of that quick release setup when I start reassembling it, btw.
The nut is just a snug/interference push fit into the rectangular slot in the rear jaw housing. The round hole you can just make out on the other side of the housing from the nut is where the rod/punch is placed to tap the nut into place.
i'm not certain, but i think you just have an older Record there on it's way to your shop next week. do you have any pictures of the other side?
No other photo's until it gets here, unfortunately. From what I've seen in the past, everything does seem to suggest it's an older style Record, but I'm always reticent taking much gorm of descriptions I see posted on Ebay or the like. Have briefly tried in the past to find any literature showing this styling, but it doesn't take long before I give up the ghost. There's just so much info crops up if you try searching Record vices that brain freeze doesn't take long to set in when scanning through.
I'll be giving it a full strip down when it gets here, so I'll search for any distinguishing marks and the like. Normally I wouldn't have punted for a Record, (they've never personally rocked my boat, to be honest), but this one just happened to be fairly close, has a different than usual styling which I do find slightly appealing, and more importantly it was cheap.

Curiosity has finally got the better of me though. I'm intrigued by these, hence decided to have a look at one when the opportunity arose, which it now shortly will.
The leadscrew spring setup sounds like the pin has sheared else something is missing, judging from the description, so that'll be getting checked over when it gets here. Apparently it is working condition generally, but currently needs the front jaw manually pulling out when opening the vice.