I also have an US M3 CAMILLUS thought to be authentic an would like to compare and get your opinions. My knife is identical to the one above with two exceptions, 1) no US M3 on the guard 2) US M3 CAMILLUS embossed on the right rear of the blade, CAMILLUS is a slightly smaller character size. Marking on the heel, dimensions are also the same.
Thanks, Gunny