Original 1st printing 14&1/2 x 11&1/2" circa 1965/66 manila mailing envelope from Mouse! Studios (9901 Meyers Road Detroit, MI), featuring a classic hot-rod/weirdo design by the one and only Stanley Mouse.
Thick pulpy vellum stock envelope (which has also been HAND-AIRBRUSHED by Mouse and hand-notated by both Mouse and Stan Miller Sr. (Mouse's dad) on the reverse) is in good to very good (B to B/B+) condition; aside from the aforementioned notes/doodles on the reverse (see photo), there are a series of stress bends/creases, a bit of corner wear, an old rusty staple on the reverse flap (which is also slightly folded/torn with dried adhesive residue) and other assorted wear you might associate with a 50-year-old piece of used office stationery, but for the most part it is in decent-enough shape.
Neat little piece of original Stanley Mouse memorabilia, right from around the time he left Detroit for the West Coast.