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There is a leather covered gun case from I. Hollis on ebay right now. The case is in Australia, but the seller will ship worldwide.

I. Hollis Gun Case

I have no connection to the buyer and know nothing about this case. Just thought I'd pass it along in case someone is looking for a case like this.

It is a shotgun case with a motheaten interior which is about par for the course with something that old with wool lining. The nice part is that since you would probably reline it anyway, it would not be hard to refit into a double rifle case by redoing the dividers. The original Makers Label is fairly good. This would make a nice addition for someone with a Hollis gun if gotten right and the shipping is not terrible. I have bought several restorable cases from England, shipping is around $100.