The way the first "N" in Franklin and the "K" are shortened as well as the narrowing of the horizontal bar of the "L" lead me to be post printing creasing. If a preprinting crease those letters would be normal when printed over the crease or expanded if the crease was opened up.
So here are a couple more. I bent the wrapper to try and open the crack more. I notice when you get more to the outer part of the die the paper seems to be tearing at the crack.
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Posted 01/04/2023 5:11 pm
Newly listed items on eBay by 3193zd. 
1946 TUBE MAILER WITH 5 CENT AND 10 CENT PREXIES CONTENTS INCLUDED!
1953 BUSINESS COVER WITH 5 CENT LIBERTY SERIES AND POSTAGE DUE METER LABEL
1942 US SELECTIVE SERVICE DRAFT MAIL FORWARDED TO CANADA
COVER TO CANADA ROYAL MINT RETURNED WITH ENCLOSURE AND UNIQUE POSTAL MARKING
US DEPT OF JUSTICE CERTIFIED MAIL WITH RETURN RECEIPT COVER
