Horizontal as well as vertical?

They benefit greatly from the addition of a riser block.

The vertical head, if a good Mklll is likely worth as much, or more, than the rest of it.

Not so desirable ad the 2B, which has more vertical table travel and stronger knee, along with easier adjustment (from the front) and larger table.

Check out completed items on epay? If it is local, it might be better than a distant purchase? 2A machines come up for sale more often than 2B variants, so relatively plenty around. Still a useful machine and likely better value than a (newer) chinese import. It is worth what you are prepared to pay for it.

Yes, a Mklll head. There were two versions. I've not seen the earlier one, except in pics, but think that may be the better one (the later one was cheaper to produce?) but I am just guessing.

I would think that the 2A would be tight for a decent sized rotary table for cutting gears with the horizontal. Even my 2B table seems small and I could do with another 30mm long travel – always need more!

But if it suits and it is not worn, go for it. Definitely a better deal than a chinese vertical-only of the same size.

Mklll heads have, on occasion, made megabucks on epay. One went for over £600 earlier this year! More sensible would have been a little over half that, but auctions can be a bit of a scrap between a couple of bidders who 'must have'.