1924 – New York, New York with an early meter imprint out of the Madison Square Sta.
1928 – Kansas City, Missouri with an unusual modified permit or meter machine installed at the Federal Reserve Sta. These were used in very few locations. The stamp is from the White Plains souvenir sheet, provable by the top margin. Philatelic, but eye-catching.
1932 – Los Angeles, California roller cancel, a very unusual style.
1936 – Binghamton, New York with a two cent meter imprint for a local rate letter, forwarded to Ft Lauderdale, FL which then required the 3 cent inter-city rate and the 1 cent due stamp added at Ft L.
1940 – Harrisonville, New Jersey registered cover to Swedesboro, New Jersey which arrived there on the same day.
1944 – Bridgeport, Connecticut airmail cover chasing a soldier to 30th General Hospital at APO 514 (Mansfield, England), then to several other hospitals afterward!
1948 (Sunday!) – Seattle, Washington Universal machine cancel on UC14 or UC15 airmail envelope.
1952 – St. Albans (Vermont) & Boston (Massachusetts), R.P.O., steel duplex with R.M.S. within the killer bars.
1956 – Balboa, Canal Zone, "Paquebot" cancel on U.S. Scott C39 booklet stamp.
1960 – Chicago, Illinois cancel on International Reply Coupon, IRC16, 13 cents revalued to 15 cents.
1964 – Hillsboro, Ohio, Sugar Tree Ridge Rural Station 4-bar handstamp.
1968 – Hamilton, Ohio International Flier machine cancel touting the use of Zip Codes, but using a dial without it.
1972 – Union City, California International machine cancel on change of address card.
1976 (Sunday!) – Rockford, Illinois facer-canceler style machine cancel on returned warranty card for buying a wig.
1980 – Milwaukee, Wisconsin with a Milcopex'80 show cachet emphasizing historic preservation.
1984 – Sitka, Alaska with Universal Model-D machine on a souvenir cover from the U.S. Coast Guard Cutter Woodruff.
1988 – Oshkosh, Wisconsin Facer canceler with 140th anniversary slogan for Berlin, WI touting the fur and leather industry there.
1992 – Muncie, Indiana paired machine and spray cancel, cropped from a full cover.
1996 – Larsen, Wisconsin (International HD-2); Castle Rock, Washington (Universal Model D); and Sturgeon Lake, Minnesota (Universal Model K) small offices had small machines, the first and last examples here being hand-cranked. Most all of these machines have been retired in favor of central processing at regional facilities.
2000 – Pensacola, Florida machine cancel, cropped from a full envelope. This almost has the look of a Chamberlain ASC (Advanced Small Canceller), introduced in small post offices about 1990 – or some similar machine. Specifically I would note the use of a 5-digit zip code, the lack of any punctuation marks, the irregular digit shape and positioning in "2000", and the wide gap between the dial and the wavy killer bars. I know the USPS was also trying to increase interchangeability of parts between machines in this era. I don't think it is a regular 4-head facer-canceler. It just doesn't "feel" right. Insights welcome.
2004 (Sunday!) – Rob Haeseler took this piece of junk mail he received on 2/24/2004 back to his Sidney, Ohio post office on February 29 to have it canceled as a souvenir. Rob wrote-up this item in his April 19, 2004 Linn's column.
2008 – Clarksburg, West Virginia, adhesive paper tape applied over the counter.
2012 – Two meter imprints on business mail, showing presort discount. Not as exciting to most of us as stamped mail, but how many of these will get saved?
2016 – Indianapolis, Indiana spray cancel provides dating, and like modern metered mail, does not traditionally cancel the forever stamp leaving its coded area readable.
The most recent items certainly show how mail processing and postal history are constantly changing. What will 2020 bring?