The rooms are all mirrors! Do you know how hard it is to take a leak in a room that is all mirrors, including the floor and ceiling? Ouch! Shaving ain't too easy as well. Chris
I'm with the OP that the mint mark looks odd. There's no real value in counterfeiting it, so it is likely genuine, but is it possible that it's repunched over another S and just a bit off center from the first mint mark or even a lamination or start of a break at the mint mark?