This envelope is like the window envelope,but the window opening is uncovered (an uncovered address panel).
A self-stamped window envelope is an envelope that has a sticker that proves payments regarding to postal office that delivers the letter.
Based on my searches, you can find to buy window envelopes online from windowenvelopes.com. Here you can find many types of window envelope that you need.
Put 1 or 2 of those sticky office labels on top
A standard window envelope is the same as a commercial windo envelope. They are both typically used for mailing such items as invoices, letters, checks, statements and marketing materials.
The purpose for window envelopes is simple. In order for business to save time, as well as ink and toner, the letters and correspondence written are labelled with the address, and folded in such a way that it doesn't have to be reprinted on the envelope itself, but will show through the window.
BFW stands for Barcoded Window Face which is a type of envelope face used for different software such as that one what is most frequently used on computers.
The answer is an envelope. It contains a letter.
The word is "envelope" (which usually holds only one letter).
It does
Envelope is a noun.
on the envelope.