Thanks to a number of people who suggested it was a Deleika, I found
the company web site and looked at their offerings.  I think the organ
I saw was the GEFI Noba-tronic - NT 26/44 F street organ.  You can see
one at http://www.barrel-organ.com/index.php?content=street-organ-sale 
The Deleika home pages are at

  http://www.deleika.de/  (German)
  http://www.barrel-organ.com/  (English)

There are a few bad links on the English pages, and a few more entries
on the German ones.

The street organ Automat AT 20 /20 F is an interesting variation on
the small organs we see at U.S. rallies.  It has a motor and no crank.
It has a memory with 30 songs, and is equipped with coin or token slot
or with manual switch, and is built for operation at 220/230V or 110V.

The 26 and 31 note "memory" organs can be extended with percussion
and/or radio links for orchestral playing in groups.

Wallace Venable