Casio W-200 Marlin, DigitalWatch Wiki

One of the unusual features of this watch is the steel screw-on case back that threads into the plastic case of the watch. From a series of Casio Marlin watches released in the early 1980s that all share the same case design: W-100, W-200, W-300, W-400. The W-200 features an unusual "racetrack" graphic on the crystal. Black case and strap, grey stripes on crystal - most common Orange case and strap, orange and yellow stripes on crystal - rare version Blue case and strap, blue stripes on crystal

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