Thanks for the spell check Nando, that was a shameless pun on my part
On the mark of the 'Espaderos del Rey', from Wallace Collection (Sir James Mann, 1962):
A545 (p.279), a rapier c.1620, "...the incongruous combination of a Toledo mark and the half moon of an Espadero del Rey with the name of the Italian bladesmith Andrea Ferara suggest this is a product of Solingen".
A652 (p.331), a cup hilt rapier Spanish c1635; blade German (?)
"...the ricasso, inside the cup stamped on each side with a makers mark and the half moon of an Espadero del Rey. "
Further noted the the mark ST is said to be for Tomas de Ayala and that the Stantlers of Munich also used the letters ST (a crowned ST) along with the name Sebastian Hernandez. The four sided blade on this example is noted to not be usually found on cup hilt rapiers.
It would appear that the half moons (which typically look like Tarot card characters with man in the moon face), were somehow often used along with makers punzon in Spain, for Espaderos del Rey (the Kings artisans).
However it is unclear whether this was a broadly used designation or strictly for select makers. The only maker noted as such by Palomares was of course Julian del Rey (with the perillo, or little dog, rampant) but no note I am aware of) with a half moon. If there is such instance you are aware of I would be grateful to know.
Clearly, the half moon mark became part of the Solingen repertoire of symbols and devices used by Solingen smiths along with other spurious Spanish names and punzones, and eventually became part of the astral groupings inscribed in Solingen blades.
This simple mark, looking in Rorschach test parlance, like a crescent (but facing the wrong direction) seems possibly an incongruent attempt to allude to the Spanish theme inscribed in the fuller with Ruiz' name.