Honda-SOHC

Hi guys I need some help. I'm new to the forum and always been in love with Honda bike, I found one 3 hours driving from where I live, the bike has 3 owner since new, the last one since 2004. He says he never has done any maintenance, only oil change every year.  Do you reckon this is a genuine bike.?I'm looking for a all original collector bike. The frame number is 2064030  the engine number is cb500e 2152699.
should the engine number start  with 1xxxxxxx.
THanks very much for your help. Regards.