Dr J.S. Vogelaar has kindly reminded me that the "new" Claritas coin referred to below was actually mentioned in RIC footnote London 119, though not very clearly. The footnote refers to Maurice. I have checked in my Maurice, Volume II, page 49 and he does record the longer PF legend for this mintmark, citing examples at Vienna and Milan. However, RIC notes that the Vienna coin could not be found and that the Milan example was found to be a later mintmark, RIC 148. Of course RIC 148 is incorrectly listed under the crescent mintmark whereas it should appear in the following crescent/star mintmark.
Hope that's all clear then ............
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