Sam Neill wears a Waltham Military

Dr. Alan Grant, the paleontologist played by Sam Neill, wears a plain vintage field watch through Jurassic Park (1993), a round dial on a worn leather strap that he puts on just before stepping onto Isla Nublar.

It is an American GI-issue field watch of the mid-1940s. Watch-spotters who have studied the frames lean toward a Waltham, though Oris and Hamilton made near-identical military watches in the period and the brand cannot be read on screen, so it stays a vintage field watch attributed only tentatively to Waltham.