This is the back stamp of the vintage 1985 collector plate "Die Nachtwache der Engel" ("The Angel's Vigil") by German symbolist artist Sulamith Wülfing, manufactured in fine Bavarian porcelain by Königszelt Bayern with Bradex number 22-K46-5.1

Located, in a Valentines Day box Royal Doughton

The current market value for the 1985 "Die Nachtwache der Engel" (The Angel's Vigil) collector plate typically ranges between $8.00 and $35.00 USD across secondary marketplaces like eBay and Etsy. 

The exact value varies based on how complete the item is:

• Plate Only: Loose plates without the original packaging generally sell on the lower end, around $8.00 to $15.00 USD.