The one I shot in 416 (and a 375H&H I saw) both came in Blue, Velvet lined cases \and were the 100 year anniversary models by ? Mauser.
I think they had somethig like this on the barrel.
As to who made them, I don't know but I didn't like it and I wouldn't pay $10,000 for one and there's plenty of Bolt action rifles I'd pay that amount or more for.