Here's a few for this thread.
First up is a combination 803-804, paying the 1.5 cent rate. Both are precancelled for Harrisburg, PA and what I really like is who the sender was.
Next is a neat cover. It features a bust of Washington in the area where you would normally find the corner card, a nice strip of three of the one cent Washington stamp and it is cancelled in Washington MO.
The final entry for the one cent Washington stamp is this use on POD Form 3817, with a later usage, in 1952.
For the two cent, let's start with a Territorial use from Hawaii in 1953, in a postcard.
Paying the drop letter rate is the next item, on an illustrated advertising cover:
For the workhorse of the Prexies, I offer three items. The first is on an illustrated advertising cover. (Yes, I like multicolored advertising covers!).
The next cover is a rather dingy looking cover, as well it should be. Note the post office rubber stamp "RUN OVER BY TRAIN AT SALEM OHIO."
The final entry for the workhorse is this piece sent to a soldier who, at the time of arrival of the letter, was spending time in the guardhouse for some infraction of military rules. Interesting piece of military jailhouse mail.
The next one is a scarce usage from a military base overseas on a postcard. This rate, according to the exhibit page this came from, was only in use a short period. This has the four cent Madison stamp.
The airmail rate is shown here is a first flight cover with a solo use of the six-cent stamp.
Another airmail use is marked by this solo eight cent use on cover, going from a sailor at sea to an officer in Coronado, Calif. Naval censor marking clears the cover.
Next up is the ten cent Tyler paying the international rate, via air mail, to Mexico. Not the prettiest of covers, but still a nice solo use.
The next item, rated twenty-four cents, is paid by a six cent airmail postal stationery and the eighteen cent Grant for an almost solo use. This pays the registration fee and return receipt fee, as well as the postage. It is also a censored cover.
The next cover uses two twenty cent stamps to pay the airmail rate to Noumea and back to USA on a first flight cover from San Francisco. The discoloration at left is from the plastic holder I used to scan it when I was first learning to scan items...
The twenty-five is shown in an uncommon use, paying for registration on a prepaid business reply envelope.
The coil stamps are represented next. The first is a two-cent drop rate cover.
The second item is a joint line pair of the three cent coil, paying the airmail rate.
The final cover is one of my favorites for this period. It is mailed, via clipper, on Feb 23, 1943, with routing instructions where the return address would normally be. The multiple franking totals forty-five cents to cover the international mail to Switzerland and registration fees. It was censored and returned to sender as service to Switzerland was no longer available due to the war in Europe.