IMHO we can date this rifle More closely: There are no German crown/BUG proofmarks visible, only the Sauer & Sohn "caveman" private proofmark and a crown/V mark that looks very similar to the London "View" mark. This crown/V mark is the German "Vorrathszeichen" = "in stock mark". Before the German 1891 proof law became effective on April 1, 1893, all guns already completed and on maker's ore dealer's shelves had to be marked with this stamp to document the proof exemption of guns made before that date. According to the German imperial order of January 4th, 1893, application of this stamp ended with March 1893, the V-stamps were to be destoyed on April 1. So this rifle was completed, but not sold, in the time span from January to March 1893.