Rumor goes it is/was ex German Air Force 54+14 P66/1005
http://www.flugzeugforum.de/forum/showthread.php?8830-Spontanies-auf-Tour-Technikmuseum-Sinsheim/page13

There is nothing written about the whereabouts in F-40 (1993) http://www.scribd.com/doc/44104267/-Mk54-From-www-jgokey-com

Many thanks for the info and the links .54+14 seems to be a good candidate

Regards
Johan