Jason Clarke Antiques has dated this piece to the 1890s.
Stamped numerically from one through to seven, this comparative density experiment set includes examples of brass, lead, iron, copper, aluminium, zinc and tin all of which are identified by the paper label affixed to the inside of the case lid.
It is possible that this emanates from the Max Kohl factory in Germany but unfortunately no makers inscription is present on the set.
A lovely and simple physics experiment set rarely encountered in such complete form and in such good condition.
Circa 1890
Jason Clarke Antiques has dated this piece to the 1890s.
You can view the stock and full dealer information on the Jason Clarke Antiques Profile Page