There's one at the Svanemøllen marina in Copenhagen Denmark - and it was one of the first boats I ever went aboard. I remember the mast flexing alarmingly as soon as it blew a bit...

It was then called "Mer et Lac" (a wordplay on "More Varnish" in Danish, and "Sea and Foam" in French). I'm not sure if it's still there.

They were once the biggest class in Norway.

I've sniffed about the 'net, though:

Restoration project

http://www.bluedome.co.uk/BB11/

Club in Norway:

http://www.bb11-klubben.com/

register of owners:

http://www.bb11-klubben.com/bb11_liste.htm

One for sale:

http://www.batmegleren.no/vis.php?id=91d1366273a93ec812428b5ba1a0063a

some pictures:

http://213.66.146.180:888/bb11/default2.htm (sold!)

A club that knows the type, and answers questions:

http://home.online.no/~eiviberg/Sporsmal_og_svar/index.html

Lost in Denmark - a yachtsmans paradise!