Well if you consider Fort Knox a coin vault....that would rank up there I believe. I'm sure some king or prince has an enormous vault filled with rare coins/objects.
Probably Solomon's Mine if it could ever be found! It probably has enough Gold still in it to again mint all of the Gold coins that have ever been minted in the world! Frank
Uh, the Home Shopping Network? (Get these incredibly low mintage Mogan dollars for $8,154.99 for 20 [minimum 50 orders]. )
I don't know about the size factor, but when it comes to value factor the Westpoint Mint would most likely have the larges quanity of valuable coins in the US. The Westpoint Mint is the only mint where they mint Gold and Platinum in the US.
Folks your missing the obvious - the largest coin vault would likely be found in some museum. Take your pick as to which country it's in.
Duh, let's see now! Would that be the Smithsonian? Sorry Doug, we are just poking some fun at the topic of the thread! If not the Smithsonian, then probably the vault of King Yabbaa Dabbaa Doo, Shiek of the Cooling Sand!:goofer: Frank