As an example to my earlier statement about how "cut" pieces preserved otherwise unknown postal markings, the following crops are taken from a handbook prepared some years ago by my good friend, the late Fred Ekenstam, titiled:
TEXAS POSTMASTER AND COUNTY CANCELLATIONS, 1850-1911.Fred collected these cancellations for over 40 years, and included the following note and page at the end of his handbook:


MikeL
Edited to correct spelling