How does the man with a $195 million contract treat himself for his birthday?! By copping a Richard Mille watch worth $500k!
TMZ Sports has learned the Boston Celtics star wanted to celebrate the big 2-4 with a big new watch -- so he hit up celeb jeweler Eric Da Jeweler.
It's not just any watch, BTW ... it's a Richard Mille, which are famously known for their unique designs, cases and quality material.
Tatum copped the all-white RM055 Bubba Watson watch that has skeletonized movement and a grade 5 titanium case band and back bezel.