Mi.19-21 (April 1946)
Cover sent from Spremberg to Dresden featuring Spremberg unofficial stamps and a 'Deutsche Post' Mi.915 (a or b?). Ref: 30.03.1945 - 9/67
Problems with this cover: According to Michel this Spremberg (unofficial) issue, became available in April 1945. The date cancellation states 30th March 1945. To the reverse of the cover is the received cancellation from Dresden-Bad Weisser. This reads 13th May 1945 (although the envelope flap breaks the date, making it difficult to read). Therefore, it's most likely a cancellation error at the originating post office. These stamps should note be confused with Mi.17 (8 Pf + 1 M) and Mi.18 (12 pf + 1 M), both of which were valid until the 31st March 1945 and are almost identical to Mi.19-22.
The Spremberg issue Mi.19a & b - Mi.22a & b (April 1945)
