M-4 browsed thru Der Neue Stoeckel and it gives 1844 - 1850. May have been a couple generations of Rudolf Berger but I am still perplexed as to the Berger & Co./Constanz Berger relationship. Rud. Berger had patents to 1860 and is listed as late as 1894 so something is amiss.

Correct you are, Wolfgang, as we have seen Damas Turc:

http://www.doublegunshop.com/forums/ubbt...true#Post323953

Kind Regards,

Raimey
rse