A premium is justified for plate flaws.
Double impressions, machine set-offs and sheet set-offs may occur and can add substantial value.
On the 1-korona denomination, show-through or bleed-through of the print is common (the red ink is also visible on the reverse). This is a normal characteristic of this denomination and does not add value.
Marginal printing control marks or sheet-total numbers may also add value.
The 4, 5, 10, 25 and 35 fillér denominations were also issued in stamp booklets.
Forgeries:
Unused stamps are very rare, so regumming is known!
