Both of the 1901 April uprising issues picturing the famous cherry cannon have specific plate errors regularly repeated in the sheet. 5 distinct varieties can be found in the following pattern: I-II-III-IV-V-I-II-III-IV-V-....

Type I: Outer frame broken over ”18”

Type II: Spot under ”18”

Type III: Broken line under denomination

Type IV: White spot in left ornament

Type V: Outer right frame line broken

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Type I: No special characteristics

Type II: White spot in ornament

Type III: Dot in head of “5”

Type IV: White spots in ornament

Type V: Broken circle of left head

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Note that the 1901 April uprising issues also exist as forgeries!

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Source:
- R. Weinbrecht: Handbuch Bulgarien, Postwertzeichen Teil 1 1879-1944, issued 1993

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