I am sure the Special Delivery marking was added in Canada. In the US covers are supposed to include a marking showing who paid the fee for special delivery service. Since the service was paid for in Canada, no additional postage due was needed, but they still had to mark the cover showing that the fee was indeed paid.
They really tried hard to forward this. I am not sure what the number 2 stamp is meant to indicate on the back, though it is in the same color as the Church Street Annex markings so my guess is that is where it was added.
Loose in Mails, December 24, 200X, Denver, CO 80266-1701 Received without Contents Rceived in Damaged Condition
I just received this body bag. It is obviously a Christmas card that was being sent, perhaps with additional contents of pictures or a long letter which needed extra postage. This is the first time I have seen a Loose in Mails cancel, though it may be unique to Denver.
Every once in a while they start a new registered mail log book and start the number count all over again. It can be fun to find the first few numbers of a new registered mail log.
There's a guy who's a real serious collector of "cool serial numbers" on paper money. He has (had?) a website but it's recently gone down (available on the Wayback Machine, though). His gallery of images is still up, though - I wonder how much it costs to buy a Martha Washington $1 bill with an E60000000 serial number? More money than I spend on my stamps, I bet.
Return to sender Not at address given New York, New York
Do not use this envelope or wrapper again.
I am not sure why the "Do not use this envelope or wrapper again." was needed. Perhaps it was simply to discourage the re-use of metered postage. This is franked with a slogan meter which adds to the panache of the cover.
Received unsealed at Hempstead, N.Y. Received unsealed at Hempstead, N.Y. Postage Due 3 Cents
Because of the different colors I thought I would try representing the colors in my post. I am not sure why the decided to stamp in twice in two different colors about the envelope having been received unsealed. I am assuming that is a postal worker's initials on the brown tape used to seal the envelope, possibly making it a provisional official seal, right? I kid.
Box Closed Promotion Expired Return to Sender Return to Writer, El Paso, TX, Nov 22, 1983
Sporting two stamps with a make-up 2 cent Igor Stravinski to make up the new 20¢ first class rate. It also sports a stamp collecting slogan. The marking in black is the first machine-applied auxiliary marking I have posted. These were used sporadically throughout the country from about the 1960's to the 1990's though it is certainly conceivable that some may still be in use.
My binder of auxiliary markings covers is 2 inches on one side and 3.5 inches on the other. Perhaps the time has come for the collection is moved to a two-volume collection.
1987 cover from West Germany to the US. Mail from the 1970's through the 1990's (my guesstimate) featured these labels sporting a single capital letter. These were used for mail routing, but I have not spotted any philatelic literature as yet describing these labels. The color of the label to the eye is fluorescent orange, but for some reason it comes out as a dull pink through the scanner. I recall seeing these in bright green, yellow and pink.
The small farming town of Kinnikinnic is named after the Kinnikinnic river in St. Croix County, Wisconsin. This gigantic postage due marking was likely home-made, so to speak. The post office closed in 1882.
This H2 National Postal Meter impression printed on a label includes the fee for special delivery service. The cover was taken down to the post office so that they would add the special delivery marking. Out of habit the postal worker cancelled the meter which was not required.