Thanks for the chapter!
Granted snapping the coin was impressive, but it seems doubtful that so much other metal was mixed in to make it snap rather than bend. After all, anything that is too pure gold could be malformed just from everyday handling as it's the most malleable of all metals so it wouldn't be as pure gold as possible. However, to be considered a gold coin the amount of gold in it would have to be above a certain percentage as well.
I'm curious as to why Kristoph views her so highly as they should have had little interaction or been close enough to have seen and observed each other. Granted he was probably in charge of security for the first prince and could have seen her interactions and actions around the prince while appearing as just another faceless guard at his post, but something seems to have sparked his personal interest. Seems the MC has gone from one troublesome fiance to him and two very interested potential suitors in just a few chapters. Hopefully they find a way to deal with the idiotic selfish three dukes without war breaking out, hopefully with someone in the one or all of the dukes' forces who aren't so blindly loyal to him/them that they overlook treason committed for selfish reasons with the civilians who are supposed to be protected being conscripted or killed.
Btw, don't most countries make it illegal to deliberately damage or destroy local currency? Not to mention, aren't gold coins usually have a high currency denomination thus usually used by big businesses and nobles while commoners tend to use iron, copper and silver coins? If so that was a very expensive demonstration that likely cost him at least a year's pay. As a former captain should have a better idea on proper handling of money. Should have pulled out a metal rod and twisted it into a pretzel.