I've read of a keg of original Unique (circa 1900) being stored under water. Each year the keg is opened and loaded in some ammo (don't know what ammo) and test fired. Each testing session results in near original preformance. Of course this could be just a web hoax, but I personally have some Unique left from a bunch I bought in '86 and it still shoots fine...
My Anchor is holding fast!