Rob Schneider Burglarized -- $175K Willie Mays Baseball Card Stolen

3:55 PM PT -- Law enforcement sources tell TMZ the burglars broke in through a sliding glass door in the rear of the home, using some kind of blunt object to break the glass.

Rob Schneider's home was burglarized Friday night and uber-expensive jewelry was taken, but nothing as expensive as an ultra-rare baseball card.

The 'Deuce Bigalow' star was at the Just For Laughs Festival in Montreal, and his wife and kid were out to dinner in L.A. when the thieves broke into their Encino home. They made off with his wife's diamond engagement ring, a Cartier watch and other expensive items.

But the biggest ticket item ... a mint condition 1951 Bowman Willie Mays rookie card ... valued at $175,000.

Rob famously collects old baseball cards, especially from the '50s and '60s. The thieves also made off with a 1953 Willie Mays Topps and a 1971 as well. The Willie Mays cards were separate from Rob's main card collection, which the thieves didn't find.

One source familiar with the investigation tells TMZ ... the Willie Mays card is so rare, it will be difficult or impossible to fence it.