I have a hand painted ashtray by Kronach OCA Kunst Bavaria advertising for Ludwig Riedhammer Industries in Nurnberg Germany. I believe the dark green makers mark is dated between 1952 and 1955 and is a rare and hard to find mark.

Top of ashtray has a coat of arms symbol with Nurnberg underneath.

Any help would be appreciated. [attachment]WIN_20180914_03_08_41_Pro.jpg[/attachment][attachment]WIN_20180914_03_09_05_Pro.jpg[/attachment][attachment]WIN_20180916_14_00_09_Pro.jpg[/attachment][attachment]WIN_20180916_14_18_26_Pro.jpg[/attachment]