[Below: A selection of variations - odd perforations, imperforate pairs and printer's waste (multiple strikes of different color designs)]

[Below: The design was also released in blocks of four - seen here is a dark paper variety and the more commonly seen white paper]

[Below: Below are another type of 'unofficial' Universal Postal Union designs.]

[Below: A double impression, sometimes called 'printer's waste'.]

[Below: This article incorrectly identifies these as legitimate Croatian government-in-exile issues.]