Gents,
It really does not matter if it is a shallow engraving, some sort of photoengraving, or stamped with ink or acid ink. Once the product was made, perhaps inspected, and sold, the longevity of the trademark would have been immaterial. Many other RZM marked products had paper tags meant to be removed.
In fact, for an organization charged with (among many other things) bringing uniformity of materials to many products, they seem to have offered little guidance in how their M7 marks were to be used. Look at SS dagger RZM marks and you can find 13 different formats.
