In Saw 2, actor Donny Wahlberg is seen wearing a black Casio G-Shock G-2500 watch. This watch is worn by his character, Eric Matthews who is a detective in the film. Not only this but his character also features in later Saw movies.
As seen here, his watch is clearly a Casio G-Shock. This would be suitable for a detective due to its rugged and practical nature. In another still, he is seen interrogating Jigsaw whilst wearing the same watch.
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