I forgot to mention, those square ones can nick up your strop, too, if you aren't careful! Just another thing to keep in mind if you plan on using them. They're really mainly useful for maintaining an Errol Flynn type mustache or something.
And I'd bet one or more are even older than the 40's, considering how long straight razors can last. I have what I believe is the only razor ever owned my double-paternal great grandfather (or whatever a father's father's father is called). It was bought when he first started growing facial hair, so that would be sometime around the late 1910's or early 1920's, I think. Probably cost less than $5. He could've easily bought other razors, but it was the only one anyone ever found, and he wasn't the type of man to buy something new, when the old one is still fine. And it does still shave (despite some well-meaning heir, I have no clue who, taking steel wool to the thing at some point! I hope that wasn't my grandma. It did take quite a bit of work to recondition, but fortunately I was able to salvage the edge), and I do use it from time to time.
Looking forward to when you can get pics. I don't think I've ever seen an outward-curved point. And all 3 razors should be deeply hollow-ground, so if the hollow grind of one sticks out, that should be very interesting to see, too.