Excelent post Chris!
I obviously agree sans serif existed in print much earlier,probably any English libary will have reference books that include some sans serif before c.1870
My point is so far theres no reliable dated evidence of the use of sans serif on bladed weapons before that date. The examples you post in the other thread are highly dubius to say the least.
Mark serifs are the small curls or flats added to the tops & bottoms of some font.
Spiral
The examples listed by Chris. for further study. {Some hotlinked as originaly posted in the blunderbuss thread.}
Strangly {img} tags dont work on the ones actualy posted on viking sword, how does one link to those I wonder?