We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
White #10 airmail envelope with red blue border Par Avion text poly window vellum finish

WESTERN STATES

WESTERN STATES #10 Airmail Window Envelope 4.125 x 9.5 20# Red Blue Border Par Avion Box 500

SKU CH-EYYF-EVHYV

#10 airmail window envelopes with red and blue border and Par Avion marking, 4.125 x 9.5 inches, 20 lb paper, 92% brightness, box of 500

  • #10 standard size fits business correspondence
  • 92% brightness white sulphite paper ensures crisp print contrast
  • Red and blue airmail border with "Par Avion" identifies international mail instantly
  • Poly window 1-1/8" x 4-3/4" positioned 3/4" left and 1/2" bottom shows address without extra labels
  • Box of 500 envelopes with remoistening seal and diagonal seam for high-volume mailing

#10 Airmail Window Envelopes, 500-count box

These #10 airmail envelopes measure 4.125 by 9.5 inches and feature a poly window positioned 3/4 inch from the left and 1/2 inch from the bottom. White sulphite paper with a vellum finish and 92% brightness provides a clean surface for addresses. The diagonal seam and remoistening seal are designed for reliable closure during transit. Red and blue borders with "Par Avion" markings identify international mail at a glance.

Suited for high-volume international mailings

Businesses sending invoices, statements or letters abroad by airmail will find the pre-printed borders and window layout convenient. Domestic-only mailers who do not need airmail markings may prefer plain window envelopes. Organisations requiring custom window positions or heavier paper stock should look elsewhere. The 20-lb stock and standard dimensions fit most inserting equipment and postal regulations for letter-rate mail.

Consistent feeding through extended print runs

The diagonal seam construction and vellum finish reduce friction in high-speed inserters and laser printers. SFI-certified sulphite paper maintains dimensional stability across large jobs, limiting jams or misfeeds. Remoistening adhesive activates reliably after prolonged storage in the box. The 500-envelope carton supports continuous operation without frequent reloading.

Highlights

  • #10 standard size fits business correspondence
  • 92% brightness white sulphite paper ensures crisp print contrast
  • Red and blue airmail border with "Par Avion" identifies international mail instantly
  • Poly window 1-1/8" x 4-3/4" positioned 3/4" left and 1/2" bottom shows address without extra labels
  • Box of 500 envelopes with remoistening seal and diagonal seam for high-volume mailing

Specifications

BrandThe Envelope Supplies Shop

Questions about this item

What paper size must the contents be to show through the A-style window?

The A-style window measures 1-1/8" x 4-3/4" and sits 3/4" from the left edge and 1/2" from the bottom, so size the address block to fit that frame.

Will these envelopes feed reliably in a laser printer that handles standard #10 stock?

Yes, they are 20# white sulphite paper with a vellum finish and a diagonal seam, matching the weight and construction of typical #10 envelopes used in laser trays.

How can I confirm the envelopes meet the 92% brightness spec after opening the box?

Compare a sheet under daylight against a known 92% brightness reference; the vellum finish should appear crisp white with the red and blue airmail border and "Par Avion" print sharp on both sides.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.