Hmmm. Well the numbering doesn't like up with the pins, so that isn't showing pin numbers.
Maybe it is a check list of the number of times it can do something, or that it has 12 configurations or the like.
It almost looks to have a top cap of some sort, can you try to peel it of or open it up?
It's almost like it's a little metal box or something. The legs are soldered in place.