United States Postage Due Meter Stamp, Type E4 Slug

United States · 1965 · Variable (Postage Due)

This listing depicts a catalog image of a United States postage due meter stamp slug, specifically Type E4. It features the text 'POSTAGE DUE' and 'US POSTAGE' within a rectangular frame, indicating its purpose for collecting underpaid postage. These slugs were interchangeable components in mechanical postage meters, allowing for the printing of various postal indicia.

Postage due meter stamps were introduced to streamline the process of collecting insufficient postage, providing a machine-generated indicium rather than traditional handstamps or postage due stamps. Type E4 represents a specific design used during a period when mechanical meters were widely adopted for various postal services.