1. marked with a stamp or postmark on the back, especially of mail or documents
Usage: commonly used in philately and postal history

1. past tense and past participle of backstamp; to apply a stamp or mark to the back of something
Usage: transitive verb

Examples

• The envelope was backstamped with the date of arrival at the sorting facility.
• Collectors value backstamped letters as they provide evidence of postal routes.
• The postal clerk backstamped each package before it was sent out for delivery.
• A backstamped postcard can help historians trace communication patterns from that era.
• The document was backstamped to indicate when it was received and processed.