No published sn data that I am aware of
About $50-$75. Rohm, also known as RG, was an inexpensive low quality handgun.
25-65 USD or so
Most Rohm revolvers were considered low quality/ low value firearms. Depending on condition, $100.
$65-$120 depending on condition
40 or so
RG is short for "Rohm Gmbh" which essentially is Rohm Ltd. in German. Rohm manufactured inexpensive (and somewhat questionable quality) handguns until 1986.
50 USD or so
50-300 USD or so
Depends on the condition of the two- but in general, the Rohm firearms are considered low value and indifferent quality.
Better than a rock, but, not by a whole lot.