Worn by: James Marsden as Tom Wachowski
Reference: Hamilton Khaki Field
Brand: Hamilton
Sheriff Tom Wachowski wears the Hamilton Khaki Field Mechanical 38mm, a faithful recreation of its original 1960s forebear true to Hamilton's military heritage. The 38mm matte stainless steel case houses the exclusive H-50 hand-wound movement with 80-hour power reserve. The watch features a black dial with light luminescent numerals and indexes, and comes on a durable NATO strap. Inspired by the military and built to last, this is the original soldier's watch—fitting for a small-town law enforcement officer who becomes an unlikely ally to a supersonic alien hedgehog.

Source: https://www.hamiltonwatch.com/en-us/h69439931-khaki-field-mechanical.html