This is the steelbook version of Metal Gear Solid 3: Snake Eater, official titled Limited Metal Edition. This version of the game is not particularly common, possibly because there is no difference between this and the original release apart for the metal case.
Also it retailed at £59.99 when released back in 2005 so I would guess sales weren’t particularly high. This can be picked up easily enough of ebay, but expect to pay £20 or more for a copy. As with all steelbook editions the condition can vary, so be on the lookout for any dents or chips in the paintwork.