Original references are quite rare.. regretably the pictures dont show the interior very well. Looks like the strap is missing. Notice the faintly showing rivets on the top which I do not remember seeing on replicas. What do you think?
http://www.hermann-historica.de/auktion/hhm50.pl?f=NR&c=47877&t=temartic_M_D&db=M-50.txt
http://www.hermann-historica.de/auktion/hhm50.pl?f=NR&c=47877&t=temartic_M_D&db=M-50.txt