You were helping people find this article.( Thank You BTW) The big problems of little Change in the 12th century. by Pagona Papadopoulou, She has continued where Michael Hendy left off, in this time period of Eastern Roman coinage I would consider her this generations expert. With Hendy, Grierson and Metcalf gone she is one of the few in the academic community that has pursued adding more information about the time period.
I recently purchased three booklets, two of them had to do with Dr Zervos study of John II tetartera ( The third one was regarding class B Anonymous follis variations. ) In his second booklet he notes one other major differences in the two variations of SBCV -1953 . Most notable and I am surprised I did not catch is that the 2/3 length version of Christ has no writing in the Bible , where as the well known version has writing in the form of dots. He does include a group 3 but I am not as certain about his findings nor does he seem certain , it is a lower weight version.