Perfins were used as a security device by private companies to make sure that their postage stamps were only used for official business. There is a specialty catalog, I believe for these German perfins though I do not have one.
If you know the German language (unfortunately I don't know) search on Google "Firmenlochung perfin"
I found on the website www.arge-lochungen.de/katalog an offer for a catalog (unfortunately access is no longer free)
Silence in the face of adversity is the father of complicity and collusion, the first cousins of conspiracy.. 04 Apr 2020 11:40:43pm
re: GERMAN PERFORATES STAMPS
And just or the sake of completeness, the sobriquet
"Perfin" is created from the full name "Perforated initials,"
Most perfims are just that, initials, but there are some such
stamps where the initials are replaced by a usually easily
identifiable shape or symbol such as a bell or a lyre.
A few are shaped into numbers as well. Some people
collec them as a topic and the stamp is inconsequential.
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