Simple question that doesn't come with a simple answer. The knives you have were made by Camillus during WW2 for the U.S. Navy. There were at least 5 or 6 other companies with contracts for these knives during the war and all of them are a little different. Many knife producers continue to make examples of these style knives to this day.
Besides the knives that can be positively identified as Navy Mark 1's there are others that seem to get thrown in with them that eventually get identified as something else. Honestly for a knife subject that could fill a coffee table book it's a little surprising how little good solid information on these knives can be found. If I knew of a good solid source on the web for learning about these I'd recommend one, but I honestly don't know of a place that covers the subject that well.
If you have an interest in Military knives in general I will recommend that you invest in a book by Knife World Magazine, "MILITARY KNIVES a Reverence Book". It contains many reprinted articles from Knife World on the subject of military knives and there are two good ones on the subject of the Navy Mark 1's. As reference books go this one is a bargain.
Here are some pages from a document that Camillus printed in the early 60's covering their WW2 wartime production, this is what they included about their Mark 1's.
You mentioned 2 USN knives. What about the one not marked Mark 1. Is it the same size/shape and just not marked "Mark 1" or is it bigger/different? Pics would be great.
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