single shot falling block pistol 9 mm claliber so very likely 9,5x47R like the pistol 6 digits before
http://forums.nitroexpress.com/showflat.php?Cat=0&Number=244637&page=0&fpart=3&vc=1
not for sale but they were helpful to give me the SN 29979
crown +V proof

http://rwnaf.org/collections/display?type=collection_items&id=506