Okay, the original frame serial number is MZBB-6426905, registered on 9/9/1998 to Thomas L., of Davenport, IA. This mower was built at the Honda factory in Swepsonville, NC.
If you'll send me a private message with your name, address and phone number, I'll update the database with you as the new owner. Or, if you feel more comfortable, contact Honda Customer Relations at 770-497-6400. Either way, we'll get you into the system, should Honda even need to contact you regarding a recall or update on your mower. FYI, you'll never get any sales/marketing from Honda, nor will they sell or rent your personal information to a third party.
Caveat: I work for Honda, but the preceding was my opinion alone.