Time For French Montana's $100k Weeknd Bday Gift

French Montana's lucky to have friends like The Weeknd when his birthday rolls around ... he just bought French a pricey new watch fit for Father Time himself.

French hosted a small gathering of his closest pals Tuesday night to celebrate his 32nd born day, and it looks like Abel came through as his #1 guy with a $100,000 Patek Philippe timepiece for the rapper ... diamond-studded and all.

Watch -- French can barely hold in his excitement ... The Weeknd can barely put down his phone.