20h Full Pane
The two galvanized plates and three master blocks used to print the 20h stamps. Their photographic negatives are preserved in the Prague Postal Museum coupled to the 30h plate negatives. The Monografie also notes [Volume IV, page 332] that a further three stamp-sized printing blocks, used only to produce proofs in red, black, and blue, have also been archived. The plate identifiers are 28/1 and 28/2.
The 20h is known to be comb perforated Type A and Type B.
Unfortunately, no full pane image is available for this stamp. Please contact Knihtisk if you can assist in acquiring an image.
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