Second go around serial number issues 69 sporty's

Just looked at the second 69 Sporty in two weeks that is registered as a 69 but the engine serial number makes it a 70. Once I understand but twice in two weeks with two different bikes?

Is there some way these can really be 69's somehow? Strikes me as awful strange. This one by the way has had same owner for 20 plus years. so if there were title games played it was a long time ago.

A little help from you guys that are real whiz at this would be appreciated.