Hi, I have a PS2000 CRB, it is said that apx 50 of these were made. There is s pic of one on a site with a certificate stating production #53 with a sn#9905122 with mfg date in2000. Mine is s#9904039 made in 1999. What production # would it be, and how would I get a cert for it? I'm thinking of selling it and a cert would be a plus.