Well Crap, thanks for that, I guess I wont be adding that one to my collection on the cheap. <500 mintage on that 1988 Hycroft Crofoot Bar. Kidding I like it, but not as much as Say this one. 1980 San Diego Coin Exchange Ingot Anaheim Metal 1oz 999 Fine Silver Bar C0412 eBay item number: 253121132356 When your talking expensive per ounce USVI comes to mind.
Hmmm. On the one hand, you have lumps of silver which aren't even legal tender. On the other hand, you have examples of history, expressions of the national will and strength of a sovereign nation, subject to a retail pricing structure which generally hews pretty closely to rarity and relative condition. Now, which is worthy of a premium? I gotta think about this.
Well first off it is offered by an estate sale company, and that is the current bid for it the mine has had a number of names Crofoot/Lewis Gold Mine, Standard Slag Mine, Crofoot Gold Project, Crofoot Project, Crofoot Mine, Lewis Mine, Hycroft-Lewis Mine, Brimstone, Gap, Graveyard (Boneyard), North Pit, South Central Pit, South Extension pit, Peninsula. It is and was not a prime producer, It was an open pit type and produce mainly gold with some silver. It produced from 1987 to 2002, 2.94 million ounces of silver between 1988 and 2002. 3 times as much silver than gold. It could be just the fact that somebody wants it because a relative worked or owned it, or wants it for their collection of mine specific silver bars. As been said why do people want all the quarters in a series when the only difference is the dates. Or why do people pay outrages premiums for defaced Carr dollars just because they were stamped on a Carson City press? Because they like them
Some people collect "vintage" bullion bars, and will spend tons on them. It's no different then spending hundreds on a "rare" Lincoln Cent.
I belong to the Watchung Hills Coin Club in NJ and one of our members collects silver bars. But not for the silver value for the rarity value. Apparently there are bars that were "minted" by various companies in the past that are rare and worth many thousands of dollars. Hey, if that's what your into, go for it!
Same rule applies: Buy the book before the bar... "The Bullion Bar Book" by Gerald P. Cestkowski is the only one I'm aware of. It lists three types of the San Diego Coin Exchange bar on page 180.
There are even very modern "lumps of silver" that command nice premiums. MK Barz comes to mind off the top of my head.