Lawfully sold over the counter and then later cancelled is the proper collection of postal revenue, is no different than affixing two three cent stamps to pay a four cent airmail postcard rate where the sender had no one cent stamps choosing rather a convenience overpayment for which the two cents in extra postage did not purchase any postal function. In both cases the stamps paid for the postal employee to do the service (work) of canceling postage stamps.
Even precancel stamps were sold at full face value by the USPS, restricted to the use by a permit holder or other approved entity. To anyone else, they are used stamps which cannot be reused even if no service was rendered.
Here there is rain predicted tomorrow but today is a bright sunny day which will be a bit warmed than normal for this time of year. I wish to enjoy the sun today, but rogdcam,you enjoy your rabbit hole. If you wish to expand your subject matter, please start a new thread and stop trying to derail this one.

As to women as Postmasters, there are many and each is or was a POSTMASTER by proper title. Likewise the person bringing you your mail, be they man or woman, they are both a "LETTER CARRIER" by proper title.
https://about.usps.com/who-we-are/p...tmasters.pdfhttps://www.google.com/search?q=fem...&sclient=imgEdit for:

Above image from:
https://postalmuseum.si.edu/women%E...stal-recordsAdditional edit because this is a thread on bulk postage due bills and to add a missing"r" above--.
Front and back plus note the booklet is stapled on--


Front--

Front--

Front--

Front and back--


Front and back--


Front only and a partial bill. Note the math with includes 128 x .32 = $40.96 Those 128 .32 stamps, likely affixed to following pages (as such pages were called on earlier issued form) were not included in the listing. Likely separated and now lost as a complete bulk transaction--

Having a party on the front, not all the same transaction, but included to show lower denomination usage.

The above postage due bills are all from the same company, Keen as with the RW64 example I showed earlier, except one of the four bills picture has a different firm name on one.