The mill looks to be Adcock & Shipley. I have an A&S 2E which is a universal mill, ie, the table swivels. The 2ER shown looks similar but older style, so I'm guessing 1840s/50s. I can't immediately see how the table swivels, so maybe it doesn't.
Looks to be pretty well equipped, although again there are questions; is the dividing head universal and if so does it have the banjo and gears?
Looking at pictures on the internet the 2ER doesn't seem to have a pickoff on the left hand table side for universal milling. So I wonder if it was a cheap version of the 2E with the universal facility deleted?
I use my A&S 2E a lot, but a horizontal mill is no substitute for a vertical mill. Ideally you need both. Here are some pictures of my 2E in action:
There are two caveats. One, these are heavy mills, mine is 3500lbs, so for me at least that means commercial movers. Two, mine has a two speed, pole switching motor, so to get the best out of it one really needs a proper 3-phase supply.
On the net 2E/2ERs are advertised at £2-3k. Depends how keen your friend is to be shot of the mill, but I'd offer up to about £1k.
If you have the space it might be worth offering a job lot price and taking everything away to be sorted later.
Andrew