Presumably it is a hysterical -- I mean, historic -- item. Do you have any idea how many "collectors" have been suckered by "Luftwaffen" Leicas which turned out to be fakes, just cheapo warmed-over Russian copies? Remember -- it is immoral to let suckers keep their money.
I have old almanacs and nikon lenses were widely used with leica bodies and faraway better than todays craps, masterpieces of photography ,
but I dont think anybody would pay that money. For 5000 , you can buy a japanese warship ship telescope , faraway more interesting and fits to the skycrapers saloon better , not a wallet size investment