Classifying Official/Penalty Envelopes

Battlestamps,

Your envelope is listed as Thorp Essays and Proofs, #600 under Penalty Envelopes (p 362, Thorp Century Edition).

Thomas

I have found this thread quite beneficial. Thank you to all who shared their knowledge on the topic.

Though it would be impractical to catalog the thousands of potential items classified as penalty mail, it would be nice if Scott US Specialized or another publication included a one-page educational summation of penalty mail and the decades in which the general types of indicia were known utilized.

This image is an unused item that I recently found which I assume falls into this category. I haven't a clue as to which decade it is associated.

Wow! My very first thread from 2009!

Bluejay2,

From the indicia and the "United States Post Office" It appears to be before the Post Office became the United States Postal Service on July, 1, 1971.

Dan