Imperforations and misperforations cand be decidedly authentic.
But who can authentically attest a multiple perforation?
Authenticity is naturally proved when part multiple perforations are found in a full sheet and is discovered from among bulk full sheets, purchased legally from Post Office. Also to it is not easy to do a multiple perforation in a sheet, that too in some part only.
A legitimate doubt for a serious philatelist worth considering, nevertheless.
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