How to tell an aftermarket KZ900 seat from an original

Does anyone have an any idea if this an original KZ900 seatl? It's in great shape with the exception of a 1/4 inche repair in the vinyl that's hardly noticeable... but that does bother me when I look at it because this is the only flaw on the whole bike. But I'm thinking an original seat in this good a shape is more desirable than a like new aftermarket. Any thoughts on that?

Looks like an original A4 seat to me.