Sure it's strange, it seems to me like someone took Avenir, narrowed the M and threw in a (flipped) Century Gothic S just because...

hmm but that wouldn't explain the E!

Pretty sure the "S" is not upside down. If you draw it so that the top a bottom are exactly the same size, that's how it will look. Flip it over and it will look the same.

@Mark: yes, I thought that about the S (I was just dramatizing about the flipping ;-)
So we can suppose this is the work of an amateur who wanted to try his/her own version of geometric caps.

Seems quite possible.