Mistake by yours truly when writing the sales copy, and no one else in the office caught it either, unfortunately. In fact, I didn't know I had made the mistake until you asked just now and I went back and looked!
With the exception of a few projects, we don't ask Tomislav to sign things because the first few times we tried were a bit of a disaster due to some very rough handling by one of the postal services between the US and where he lives. Like, I'm pretty sure there's someone in the system between us who has a vendetta against printed matter and won't allow it to arrive in one piece.
So we wouldn't have asked him to sign, and I just bungled the sales copy. Very sorry about that. Anyone who is bummed by this oversight should definitely send me an email (address below) and I'll find a way to make it up to you!
Brian