The overprinting was done in letterpress technique with a small, manually operated, printing machine. On the first printing a setting with horizontal pair was used, so multiple passes through the press machine were required for larger pieces.
Due to the intensive hand manipulation with inserting, moving and touching stamps between each passes a lot of these stamps exist with the fingerprints and other smudges.
Fingerprint of one of the workers in "Kraljek & Vezić" printing house.