Par avion by air mail form 2978

A vintage postal form!

Form 2978 is a type of air waybill used by the United States Postal Service (USPS) to ship international mail by air. "Par Avion" is French for "by air", and it's often used on international air mail forms to indicate that the mail is being sent by air.

Here's a breakdown of the form:

Form 2978 was widely used in the mid-20th century, but it's largely been replaced by electronic air waybills and other digital shipping systems. However, vintage postal forms like this one can still be found in archives and collections, and they're a fascinating piece of postal history!