DDR
Now showing: DDR - Postage stamps (1949 - 1990) - 1 stamps.
1981
Conservation of Energy
21. April WM: None Design: Bobbe Engraving: Stampatore: Deutsche Wertpapierdruckerei (VEB) Perforation: 12½ x 13
![[Conservation of Energy, type CFS]](https://swmedia-4cd6.kxcdn.com/media/catalogue/DDR/Postage-stamps/CFS-s.jpg)
