Kyiv #3 Authenticity

As I mentioned, there are many forgeries of overprinted Soviet stamps. Lobko's catalog has this to say about the Kyiv #3 series:

Various forgeries exist that were printed or hand stamped. Colors, which imitate the original overprints, as well as colors that were never used on legitimate issues, are known. Some overprints do no correspond to legitimate overprints, or they appear on stamps that were never authorized for printing...

The section concludes with the statement that "recognized experts should be consulted for identification."

I don't know enough about the Kyiv #3 stamps to be able to tell with certainty that an individual stamp is authentic. However, I was once lucky enough to acquire some strips and blocks of Kyiv #3 stamps that had margin text on them. I realized my good luck when Lobko's catalog went on to offer this as evidence of authenticity:

In the sheet margin text, "Poshta Ukraininia 1992 r...." (this is a transliteration, which means "Ukrainian Post 1992 y[ear]...") on all sheets, the letter "p" (Ukrainian Cyrillic character for "r") possesses the following peculiarity: The hoop of the "p" either does not touch the vertical stem or it thins out. On all forgeries, the hoop exactly joins/touches the vertical stem.

A quick survey of the margin inscriptions on my strips indeed shows this characteristic thinning: