Omega Seamaster DeVille - Henry Golding - Crazy Rich Asians
The watch has a bold case and black leather strap. It looks like a vintage Omega Seamaster DeVille, but this needs to be confirmed with a better photo. if you know the brand and model of the watch, please contact Watch-ID here.
UPDATE April 2021: Thanks to a message via the contact form from Mingu Jeong, we now can confirm that this is indeed a vintage Omega Seamaster DeVille. An interview with GQ October 2, 2018 with Henry Golding verifies that he was indeed wearing an Omega Seamaster De Ville (vintage). See YouTube video (timestamp 0:54).
The vintage Omega is part of Henry Golding's private collection and he wore his own watch in the film. We can see in the close up of the watch in the GQ interview that Golding's watch has a Date window at the 3 o'clock position.
You can find vintage Omega Seamaster DeVille watches on eBay.