Tea-Service Pieces. Tea-Service Pieces. Whether vintage or reproduction, Jenaer glassware can handle very high temperatures. The teapot, top, and teacup, bottom right, are reissues of 1931 Bauhaus designs by Wilhelm Wagenfeld. The vintage teapot, middle left, teacup, middle right, and creamer, bottom left, are Heinrich Loeffelhardt's late-1950s updates of Wagenfeld's originals, designed with angles better suited for automated production.