No, it's an "S" all right. I blew it up and tried to get a better look. The first character is S. It looks like S122 (or 128) [space] S6169. The second S, well if that's a 5, the person that punched it on there must have been tippling...
CaptnMorgan: when you take a close up like that turn on the MACRO function of your camera. It's the one that has a little flower symbol. Makes for a LOT more clarity.