Hey!
I'm currently trying to investigate the legitimacy of a letter for a project I'm working on and was hoping someone with more knowledge about stamps could please help me with something.
I have a letter that is dated as being written and sent from Chicago to Wisconsin in
May 1992 - according to both the letter itself and the postal mark - but the stamp (a US homage to the Chinese New Year of the Rooster) was apparently only released on
December 30th, 1992. Some seven months after it was seemingly affixed to this envelope.
Is this cause for suspicion? Or did certain stamps sometimes hit the market sooner, dependant on what part of the USA one was in?
Any help would be extremely appreciated!
TYIA x

The stamp. "Issue Date: December 30, 1992" - according to MysticStamp.com

The postal mark and stamp on the envelope in question

The letter with date marked May 28th 1992PS: I apologise if cross-posting is against the rules on here. I'm unfamiliar with the community and wasn't sure where best to post such a question!