The blue one without perforations is the 771. If you have a blue one with perforations, it is CE1. The Red/blue one is CE2. (CE= Airmail Special Delivery)
Tonya.....immediately after the air mail listings you'll find the Air Post Special Delivery stamps....yours is #CE2......P# block of 4 w/2#'s mint hinged is $8.50....MNH is $12.50.........values from my 2010 Specialized.
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