No. 10 Airmail Service Regular 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

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No. 10 Airmail Service Regular 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