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 and W-400. The W-400 features the same Module 106 as the first Casio Marlin watch, the H-101. Blue stripe on crystal - most common Orange stripe on crystal - rare version
Casio W-200 Marlin, DigitalWatch Wiki
File:Casio W-86 digital watch (front closeup minor retouch).jpg
Casio CA-851, DigitalWatch Wiki
CASIO - W-35 - Marlin - Vintage Digital Watch
Casio Marlin MDV 106 Duro: An Affordable and Durable Diver
Casio W-200 Marlin, DigitalWatch Wiki
VINTAGE CASIO W-400 marlin alarm chrono lcd watch from 1982 japan
VINTAGE CASIO W-400 marlin alarm chrono lcd watch from 1982 japan
Casio Marlin
CASIO - W-35 - Marlin - Vintage Digital Watch
The Bill Gates Casio Duro MDV-107 watch review