Just sharing my two cents... Repairing or replacing interior zippers is a common activity. As for the #9490 Suspender Bag, all the versions I've seen, pre-creed and creed vintages have been unlined. As for not seeing the stitch line on the suede side of the zipper, you have to look real closely. Evidence of it is probably impossible to find on the zipper's bias tape.
I've "borrowed" (thank you rachelsthriftycloset) a photo from a past listing that perhaps shows where to look. I can't seem to find the photos of the one I had in the shop early this year. They must not have been archived and hopefully still reside on on of my other devices. Will have to look ...
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Btw: if you don't have a local source you trust to do a quality job, I believe that the price sheet for having interior zippers repaired at
COACH's NJ repair facility showed in the $35 category.