Thanks Geno. With the crowns, this Model 2? Sauer example could be posted on your Sauer Crowns thread. Jeff Stephen's composed serial number sequence contains the above in the range for 1887. Mr. Jim Cate of GGCA on page 78 of his text gives Sauer 34,521 with Ed. Kettner's name in the same location as circa 1892. The "Cal:18.2" just may be the tube diameter in mm at some point in the process(is it a 12 bore??) and is also seen on Sauer 34,521 but instead of the "BAND", the tube is stamped "BERN" and Mr. Cate gives the stamp as having an origin in Switzerland. So maybe the rough tubes were imported from Belgium thru Switzerland and on into Germany. Right off I don't know of a facility or city named "BAND" in Switzerland but that doesn't mean much. I'm not sure if Sauer was fully mechanized by the late 1880s but they could have easily outsourced some work or a mechanic with the initials may have worked in a specific area at Sauer. There are several guesses for "AW" which would be August Weiß(not sure if he was active this early), Adam Werner(he would have been up in years) and several others. A ledger or work-order more than likely would solve the puzzle.

Kind Regards,

Raimey
rse