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The "F" series of Casio watches goes back to the first resin watch Casio ever made, the F-100 in 1977. They weren't water resistant. The later models with the "W" at the end were water resistant to 30M. (F-91W, F-84W). Over the years there have probably been over a hundred F models. Yes there was an F-92W, an F-93W, two F-94W models.. These aren't the years they were made as some think. The F-91W is from 1989.
The "W" series of Casio watches started in 1980 with the W-150, listed in catalogs at the time as their "Watersports" watches. Very generally, the 3-digit W models have 100M of water resistance (The steel screwback "Marlins" W-150, W-250, W-350... the resin screwback W-100, W-200, W-300..., the panel back W-800H). The 2-digit W models have 50M of water resistance (W-59, W-86, W-96). I believe they ran out of 2-digit numbers to use, so the W-201 and up are also 50M of Water Resistance despite having 3 digits. There have probably been over a hundred W models as well.
