Here are some pics.
I would welcome suggestion and information of the rifle to enrich my knowledge.
I have revised the post based on suggestions received and added some pics for identification.
It is written that "HAENEL MODEL II D.R.P.
No SL found.

HI! the Haenel came in DRP I DRP II DRPIII . DRP means the German patents that were in force until 1945. I can't verify the start date for D.R.P. markings, but it looks like they probably began either in the 1870s or 1890s.The date of manufacture is stamped under the barrel, around the point where the barrel enters the baseblock. It's very typical of German airguns to have a date stamp somewhere on the metal parts. The M.O.D II is only different from the M.O.D III because of the set screw on the trigger; otherwise it is identical.swajan wrote:Like to know if any one have a Haenel Model II DRP, kindly provide me a detail information about factory, year during which manufacture etc