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I'm going off Wikipedia, which says the foil dates to the 16th century, and was used in France as a training weapon in the 18th century. Is that information incorrect?

Is there something in particular I should be looking for?

The swords are commonly referred to as the fencing foils, as that is what they are. I have two with the double thumb notches, but have never seen a wedge like that on a Greaves razor. Very cool.