Picked this up yesterday. Achim has a similar case, but a later date and with a Single Ring in it. The serial number on this one is C885326 (1915). The price was right even if it was in a plastic bag, so I bought it. Doesn't have period blade cases, but pretty old DE cardboard blade packs.
I've seen plenty of old cases with new razors, but I don't recall an old razor in a new case.
Still, nice case, nice razor.