This is not the Cortado Tin Can microphone, though it has similarities, but it is Cortado driven. It’s a crystal mic, more of the sort you’d’ve seen in the late 1930s and through the 1940s, with a large front-facing diaphragm. (That white disc is a solid piece, and that silver “can” is actually metal-tape-lined cardboard.)
Build writeup is in a couple of parts due to reasons, but the big one is here.