Unified Vietnam, January 1st, 1979; 20 Years Republic of Cuba (Michel Nr. 1015); A partial printing of this stamp comes in a version with a significant plate error; a diagonal white line in the red print in the upper part of the stamp.
The author initially thought this may be a pure printing coincidence (that is not catalogued) but recently he found another pair that showed the same error confirming a true plate error. As a matter of fact, the lower pair shows a progression of the error. In the middle left part of the error stamp there is a second diagonal white line indicating further deterioration of the red printing phase. The location of the plate error in the sheet and its rarity is yet unknown.

Registration No. 200650

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