You could be correct, number from the back on the fob is BAB237131-056.1 button works for lock and unlock.Interesting. My recollection is that the PT398-07101 was 1998-up and PT398-07100 was 97-back.
I also have a vague recollection that the 07100 was forward compatible and the 07101 was not backward compatible.
Oh well.