Actually, that looks exactly like my Rohm .22 RG10.
There is a lot of bad mojo about that gun doing bad things to the shooter and not being able to hit anything beyond 5 feet of the barrel. I have only fired mine once when i bought it (paid $20) and it did just fine. I don't know if I got a good one or if mine is just in better condition than other ones people have issues with, but be careful if you use it.
As for info about it, it was made in germany up untill the late 70's. Due to their "saturday night special" status and history of failure and cheap construction, they were banned from being imported to the USA back in the early '80's.
Best thing to do is either have it checked by a good gunsmith before you use it, get rid of it, or keep it but only as a last resourt after u have run another better gun out of ammo. In fact, it might be better just to throw the rohm at your target.