Heh....the two does look upside down in the photo...but actually it is just kind of funky looking on its own...and I think the angle might have thrown you off. Here is a vertical photo....it does kind of look like more of a backwards S than a 2
I think the fairly rough machining and possibly someone filling it in later with crayon or liquid paper might lend to the weirdness...even right in front of my face it looks weird...at the right angle it looks right though.