Rohm is also known as RG (the G is for the German word for corporation). Apparently they started out making 22 blank-firing starters pistols. As I understand it, they slightly redesigned one of these to fire live 22 ammunition and sold that on the American market. It apparently sold pretty well because it was dirt cheap, but it was a bad quality gun, because a starters pistol can be a glorified cap-pistol. Rohm was never able to shake the poor reputation this line of 22 revolvers gave it, as Hondo 60's post demonstrates.
They seem to have begun making better guns when they began making them in centerfire calibers like 32 S&W Long and 38 Special, but at first they still seem to have been kind of shoddy. I have one of their very late 38 Specials, and it seems as good as the "Arminius" line of revolvers by another German maker, Hermann Weihrauch. But by that time these inexpensive German revolver were being driven off the market by their own rising prices (due to the rising value of the German mark) and by better-looking, cheap but all-steel revolvers from South America, like Rossi and Taurus.
BTW, I suppose you already know it, but the ruling material of these German revolvers was a zinc alloy that could be precision cast, with steel for the barrel, cylinder, and firing mechanism. Zinc alloy is decent stuff if the gun is designed properly, but it just isn't as strong per unit of volume as steel or high-grade aluminum alloy. (I am not an engineer, so I have probably expressed that badly.)
Given that these guns were made to be inexpensive instead of durable and are mostly over 30 years old I would say it would have to be in mint condition AND low-priced to be worth taking a chance on as a shooter. Even then, I would not get your hopes up. Decent but cheap was the target their makers were aiming, and if they missed, it was on the side of cheap. It would be more of a novelty and a learning experience than anything.
PS - I don't know about any steel-framed RGs, but I don't know everything. Weihrauch did sell steel-framed Single Action Army replicas under the Arminius name. They seem to have been fairly well regarded, but I was never sure if they made them themselves or bought them from someone else.