The authors briefly recapitulate the evolution of views on the coin with crowned initials IO, which are in accordance with present theory considered as Moravian struck under the reign of Margrave Jobst of Luxembourg. The main part of the article is based on iconographic analysis, a summary of currently known specimens of coins with a lower nominal IO - hellers.
The authors represent five new variants of higher nominal - denar coins with IO and updated inventory of finds of coins with IO. The article is a review of the literature dealing with these Moravian coinage.