Good memories, guys. I, too, vaguely remembered that Jim Coogan had a half-step concertina. In the archives of Irtrad-L I found the following:
QUOTE
If anyone is interested - I have a lovely Juergan Suttner 7 bellows
(leather), Polished steel ends and buttons - 24 button (12 aside) tuned in
the keys of D and C#.
Plus there were several later posts in which he again offered it for sale, and finally one with a link to an eBay auction.
I thought Jim had also posted once that it just didn't turn out to be as easy to play as he expected (he plays D/C# accordion), but I couldn't find that post.
Then I found the following in the Google archives of rec.music.makers.squeezebox, posted by Dan Richardson:
QUOTE
Another example is Jim Coogan's box.
He's a 2 row dbb player.
He had Suttner build a C#/D "anglo".
Sounds like perfect idea, fully chromatic in only 2 rows,
nicely standardized, no new fingerings to learn.
I owned it for two weeks after he gave up.
I found it to be utterly unplayable.