100 Korun With Omron Rings

The "Omron rings" designation refers to the EURion constellation — a pattern of small rings scattered across the note that triggers photocopier and image-editing software to refuse reproduction. Its inclusion on this variant marks a discrete but deliberate update to the Czech 100 Koruna series rather than a full redesign. Kulhánek's engraved work, executed here by Ondráček and Fajt, is among the most technically accomplished intaglio printing produced domestically in central Europe during this period — the State Printing Works in Prague has long maintained engraving traditions that most Western mints outsourced decades ago.