Of course, Sir Nando,
Right at your command and service:
here are the hammer prices (plus 23 per cent commission for the buyer, minus 23 per cent for the consigner) of Hermann Historica's Munich back till 2012 (descending). As they prove, prices greatly vary.
Please forgive me for not finding exactly the items posted before as I picked them up from the web at random.
Best,
Michl