look into Wirtgen" Das Zündnadelgewehr" and there is another revolver 0,39" number 6862 similar to the revolver 6836 above also with the same "RC" stamp for the military revision commission. to make it a little bit more complicated this revolver have also the crone +V proof after 1891. its the standard book about needle fire rifle's but dont know anything about 1500 revolver bough in the war of 1870/71. it say this revolver's were bought for a trial before the war. anyway if this is true I can cut of the idea that the Franz v. Dreyse revolver were in serial number block of the other civilian hunting and target guns and rifles.