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Notorious B.I.G OG Plastic Crown Sells for Half a Mil ... Originally Cost $6!!!

The Notorious B.I.G.'s famed King of NY crown just got passed on to another for an absurd price -- over half a million bucks, which is juuust a bit north of the OG street value.

It's true, the headpiece Biggie wore in his iconic final photoshoot from 1997 -- that's been duplicated in prints thousands of times over -- just got sold off in a Sotheby's auction ... ultimately going to a bidder who was willing to spend a whopping $594,750 for the thing.

Pretty badass, right?!? Well, maybe ... keep in mind, the crown is actually made of plastic -- and ended up costing the photog who first used it with Biggie a mere $6 off the street.

Do the math ... and that's just about a 10,000,000% markup in value. And, all because the crown was worn by B.I.G. -- plus, the fact it's gone on to become a fixture in pop culture.

And, get this -- the photog, Barron Claiborne, says the crown concept almost didn't happen ... and it's apparently because Diddy wasn't feeling it at the time, allegedly saying it was gonna make Biggie look like "Burger King." Big Poppa didn't care though ... he wore it anyway.

As they say, heavy is the head that wears the crown. And, even heavier is the price tag.

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