Thanks! -- Other than the weird Star Trek "S", this sure does seem to come close. Amazing how hard it is to find an "M" like this. BTW, this Telegrafico seems to have no numbers.

Yup. This is just what I've been looking for too—it's used in the end credits as well. I fear it may be custom, but not sure. Another characteristic is that the sides of the cap "M" are purely vertical. Please, Promenader, if you hear of anything...