postmarks

postmarks can reveal the history of letters.

collecting postmarks is a popular hobby.

postmarks help identify where a letter was sent from.

the postmarks on these envelopes are quite rare.

he studied postmarks to learn about postal history.

some postmarks are valuable to collectors.

postmarks can sometimes be used as evidence in court.

she carefully examined the postmarks on each letter.

postmarks can indicate the date a letter was mailed.

he has a collection of vintage postmarks from around the world.