Postal stationery - envelopes

Many postal services released "official" envelopes, usually pre-stamped, with a logo to promote a specific event or cause. Not to be confused with First Day Covers, these envelopes are not tied to a specific stamp.

Please e-mail me with pictures and information of any additional pre-stamped and postally-released envelopes you have. Postal stationery in postcard form can be found on the postcard page.