Paying for an oldie

The B&O has always been one of my favorites as well. Your best guide will be to place a 'watch' for B&O F3 on eBay and look at them for a week or two. Although clean examples can still command a hefty asking price, with all the re-issues and clones by Williams (a beautiful example) and others, the price of a good 2368 has come way down. You should be able to locate a matching B unit after a while too but consider your costs having to deal with several sellers.

Try asking what the folks want for the A unit first and play it by ear from there.

I would say $200, a decent pair only brings about $400-500, a mint boxed unit or set is another story. The b-unit must be harder to find and a b-unit box alone will bring $400 or more.

Original A unit only in exc condition with no box - $250 - $300. A dealer would try to take it for $75.

Same condition with B unit and boxes and liners $1200+. Ten years ago it would have been $1800 to $2200. The master carton alone in exc condition can easily sell these days for $1200+

I'm with bigo426 and 400e on this. Considering the condition [no box, and only the one piece], $200 to $250 would be a fair price for it. Don't go by ebay here. Sure you can tell them that you can get one on ebay for x amount, but that is horse trading.  In this case you are dealing with freinds of family. You don't want to take advantage of their not knowing it true value. Get your deal of the year somewhere's else.