Window Envelopes are used for many business and personal correspondence purposes.
Window Envelopes allow an address to show throw the window eliminating the need to address the outside of the envelope.
The Number 10 at 4-1/8" x 9-1/2" is by far the most popular size in this grouping and is perfect for inserting
a normally folded 8-1/2" x 11" letterhead, allowing the addresses to be seen through the window.
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