RWS is currently distributed by UMAREX Co. I would contact them at the link below and ask for assistance.
Either South Korea or Japan
I suggest Crosman Pellgun oil or RWS pellet gun oil.
RWS has been making various models for a long time. Which model are you asking about and what condition is it in? You will have to give more information about the condition in order to get an estimate of value.
RWS has been made by several other air gun manufactures. Diana has made several for them over the years. Right now I think it's the Diana RWS 350 Feuerkraft that is rated at 1250 FPS. But if you are looking at power not speed, then the RWS CA-715 fired a .22 cal at 1200 FPS. It look just like a ShinSung Career 707 made in Korea. RWS also had a CA-707 that fired a 9MM pellet.
RWS Group's population is 400.
RWS Group was created in 1961.
These prices are for pistols in EXCELLENT Condition (Like New) no scratches or dings, rust or any damage. BSF S20 $105 RWS LP8 $205 I suggest Gun Brokers on the web
I would use Crosman Pellgun oil. Or RWS air gun oil.
About $225 used.
Not a real gun, but, it is a real product.
It's Obviously not a real gun. It's a future warfare gun.