Bought this at local Carboot and wondering if it is what it says on the Tin !!!, or in this case Stainless Steel !!!. I believe it’s c1970s and German !!!, seems the guy Smelting is made of Silver and the Sparks are 18ct Gold all on a Heavy Stainless Steel Plate or plaque !!!. Would be grateful for any input and should I clean it ?. 
If the silver was evenly tarnished I would say leave it, but as there seems to be an uneven finish I would be inclined to clean it. Let’s see what others suggest…
Phil
Gave it a warm soapy water wash as I do most of my finds, now I’m tempted to clean the silver with a Silver Polish cream 
1970er Jahre, Edelstahl, Silber und Gold, gestempelt REMANIT 1880, Gold 750, Silber 925, WKS, flache Schale mit gewölbtem Rand, aufgelegt ein Stahlarbeiter aus martelliertem Silber beim Gießen, Aufschrift Krefeld, geringe Altersspuren, L 21 cm.
Nice result! 
I’ve always been amused by the phrase “original patina.” Unless the maker applied an oxidized finish to a piece, there’s nothing “original” about years’ worth of tarnish.
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My thoughts exactly Jeff, if it says Silver on the Tin then keep it shining . Have a great day 