If USPS had existed, and if they could have made some money from it, they’d had some strange stamps even back in the 1930s. However, USPS didn’t exist then!
“back in the 1930s. However, USPS didn’t exist then!”
This little factoid says differently.
Oldest Post Office is in Castine, ME. This office has been in continuous operation since 1814.
http://www.usps.com/communications/newsroom/postalfacts.htm
http://www.usps.com/postalhistory/postal_service_begins.htm