No. 10 Airmail Window Envelopes w R/B Border and "Par Avion", 4-1/8" x 9-1/2"

Description

No. 10 Airmail Service (A) Window Envelopes w Red and Blue Border, 4-1/8" x 9-1/2", White Sulphite, "Par Avion" on Back and Front (SFI Certified) - Box of 500 Envelopes