The public observatory and planetarium was opened in 1st June, 1986.

On the obverse the public observatory and planetarium of city Drebach is visible. Above the building the Big-dipper, with the Alcor-Mizar pair in its handle, the Saturn and a comet is depicted. Legend: "EINWEIHUNG DER JUGEND - U. FERIENSTERNWARTE", "FG NUMISMATIK ZSCHOPAU OG DREBACH", in the middle "KULTURBUND DER DDR". On the reverse the coat of arms of Drebach, its foundation year a1386, and year 1986 is visible. Legend: "ERZGEBIRGSGEMEINDE" "KROKUSBLÜTE IN MÄRZ-APRIL" and "600 JAHRE DREBACH".

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