I'm going to go out on a limb and suggest that it's an M9 bayonet made by Lan-Cay with the letter M stamped on its butt.
What specifically are you asking? The M9 bayonet is a reasonably stout 7" knife produced by a series of companies (in your case LanCay, later restyled to Lan-Cay). IIRC, the blades are 420HC. They're super common (I see them a bunch on gun show knife tables, for example) and can be purchased quite inexpensively.
I've been considering adding a Lan Cay to my bayonet collection. I am courious what the "m" is for, myself. Keep in mind that the M9 is an "assembled" knife. You may have a "Franken-knife" because many parts interchange between brands. Who knows how many times that knife's been apart.
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