Does this constitute a 'pen cancel'? This is what I think of when that term is used, and I like this very much.
generally, most of the pen cancels i have seen have been an "x" or some squiggly lines. here's an example of squiggly lines... not my stamp, just borrowing the pic... View attachment 948
I actively search out pen cancels especially if they are the old "quill" style of course! (like yours shown above on cover) Also the manuscript cancels will command a premium (from me anyway)! The newer ones done by the dreaded Marker-Monkey aren't worth jack however. That's just a crime.