Optical instruments design type (#4968)

(See all uses as list)

Germany semipostal 4/10/1981 40+20(pf) brn issue=youth 1981

Germany semipostal 4/10/1981 50+25(pf) brn issue=youth 1981 d=telescope about 1770

Germany semipostal 4/10/1981 60+30(pf) brn issue=youth 1981 d=binocular microscope about 1860

Germany semipostal 4/10/1981 90+45(pf) issue=youth 1981 d=Octant 1775

Berlin semipostal 4/10/1981 40+20pf issue=youth 1981 d=theodolite approx 1810 perf=13.75

Berlin semipostal 4/10/1981 50+25pf issue=youth 1981 d=Äquatoreal approx 1820 perf=13.75

Berlin semipostal 4/10/1981 60+30pf issue=youth 1981 d=microscope 1790 perf=13.75

Berlin semipostal 4/10/1981 90+45pf issue=youth 1981 d=Sextant approx 1830 perf=13.75

optical instruments design type