The Mail Early reminders were used over the ten year period from 1968 to 1978. They were added to all but seven commemoratives, to some definitives, air mails, and two special deliveries. There were four types including a tab on booklet panes.

These inscriptions may be saved as a single margin stamp. However, they are usually sold as margin blocks of six since the inscription is seldom near the corner of the sheet.

   - Type III

 - Type I

"Mail Early in the Day"

  - Type II

"Mail Early"

 - Type IV

"Mail Early in the Day" with a stylized clock