Jim Carrey wears an unidentified watch

Ace Ventura wears a plain steel watch on an expansion bracelet through Ace Ventura: Pet Detective (1994), visible in glimpses as Jim Carrey gestures his way through interrogating dolphin trainers and harassing Dan Marino. The case is round, the bracelet metal, and the dial isn't legible in any surviving frame clean enough to read it, so the brand stays unconfirmed.

The watch gets misattributed more often than most: a silver-tone Timex worn by Carrey as Ace Ventura shows up regularly in write-ups of "the" Ace Ventura watch, sourced to an actual screen-worn prop sold at auction. But that piece is documented as coming from the 1995 sequel, When Nature Calls, not this film. The two performances blur together easily since Carrey plays Ventura with the same rubber-faced physicality in both, and wardrobe continuity between a hit comedy and its fast-tracked sequel is exactly the kind of detail that gets flattened in retellings.

Until a clearer frame turns up, the honest answer is that Ace Ventura's first watch is a real one and an anonymous one, the opposite of the character wearing it.