the only serial numbers that start with an X were either WVB or a WIFI deca. kinda tipsy right now so i cant remember which. leaning to WVB. if i had to guess I'd say old as hell. and the dish has nothing to do with the LNB. they may be installed at the same time, but you can replace the lnb multiple times over on the same odu. case in point, saw one of the original KAKU odu's a while back with 1800 MHZ cable. ended up not working on the system because of some reason or another, but the ODU would accept a RB3 LNB if i decided to put it in.