This Casiotron S-15 is released way back in the 1976 when Casio first released their lineup of digital watches! Such a joy everytime I wear this watch! : r/casio
Early Casio – Casiotron 04-502 | The Watch Site
Coolest Vintage - Non-traditional Casiotron dress watch. Inside the gold plated case, a well concealed Casio stamped dark grey module confirming the whole thing was produced in-house. Can't find any info online,
Casio Casiotron S-12 – My Retro Watches
Casiotron 46CS-27 – 20th Century Watches
Casio Casiotron R-19 - Old Crap Vintage Computing
Casio Casiotron Vintage Men's Watch - Etsy
Vintage Casio Casiotron Watch Men's Lcd Digital Quartz - Etsy India
Casio Casiotron R16 - NOS – TiccTacc
The Casio Vintage Club | Casio Casiotron 01-501(01), release date 1974 November, this is the debut model, the beginning of Casio wrist watches, the very first model
X - Casio Casiotron TRN-03 WR Digital Vintage - G-Shock Vintage