From correspondence discovered at the U.P.U. archives in Switzerland, it is clear that this stamp was send as specimen along with the 1881 Die I, CC watermarked issue. As the later did not include a 30 Paras stamp, something that was in fact required for military mail, one could clearly consider the two issues to complement each other and even go to the extend of saying that the 30 Paras stamp was part of the Die I - CC issue.
The appearance of the next 30 Paras stamp was in the Die I - CA watermark issue which was issued in 1882. So the need for this value was evident as the postal need of the Island required this value, which could not be made up from the rest of the series.
One of the few large blocks known to exist with the 30 PARAS surcharge. The block of 30 on the left (AG-EL) is from plate 216.