@Rick Denney
Assuming that bottom edge is glued together really well with Tite Bond II white glue… and the edges of the torn Tolex are well glued down well…
… you might consider dropping it off at a friendly automobile shop, masking it off for them, and asking them to spritz that area with truck bed liner (when they were already doing a truck for someone else) - particularly since that’s the bottom of the case, and has-received / will-receive the majority of the scuffing action.

I believe that case came with an 84 C version, but – having not sold that case with that instrument, I was later delighted to discover that it was also long enough for the B-flat version. With wide bells being so en vogue - now - for so long, long
/skinny cases and bags are rarities.