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10 Double Window Envelopes, 24lb. Bright White, Top Window Size: 7/8 x 3 1/2 (1/2 left, 2 5/8 bottom), Bottom Window Size: 1 1/8 x 4 (3/4 left, 1 bottom) | Envelope Superstore
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Viking Envelopes with Window DL 220 (W) x 110 (H) mm Self-adhesive Self Seal White 80 gsm Pack of 1000 | Viking Direct UK
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