Neymar Gets $280K 'Casino' Watch Featuring Moving Roulette Table

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If Neymar suddenly gets the urge to get a little gambling in -- all the guy's gotta do is look down at his wrist ... 'cause the soccer superstar just copped a "Casino" watch that features a moving, built-in roulette table!!

TMZ Sports has learned he recently snagged the piece from Jacob & Co. ... and it's awesome -- and quite pricey.

We're told it's worth $280,000 ... but well worth the cost -- as it comes with all kinds of bells and whistles.

The guys at Jacob & Co. say it's 18K rose gold and has curved anti-reflective sapphire crystals in the case. They also tell us it's got alligator skin on the strap. But, most importantly, it's got a fully functional roulette…