use postmarks in a sentence.
The haunting thing about the cards is that the postmarks are a year old.
"We're noticing that most of the postmarks are a couple of days," Young said today ....
the military mail sytem doesn't use "postmarks" -but Gore didn't give a damn.
The envelope was dull and faded, and did not display any postmarks, but sported a postage stamp that had been outdated for three years.
There were letters with foreign stamps and postmarks on them, and several receipts and memorandum accounts, and a letter of credit for eight hundred dollars.