These items are vintage beer coasters, or bierdeckel, from the Feldschlösschen Brewery in Switzerland.

Item Type: Collectible cardboard drink coaster (beermat).

Brewery: Feldschlösschen, based in Rheinfelden, Switzerland.

Design: Features the brewery's castle logo, wheat stalks, and the brand name in German.

Usage: These are popular items for tegestology, the collecting of beer coasters.