How to find the serial number on my calculator (Casio fx-9860GIII)? : r/calculators
Do g shocks have serial numbers? — CasioFan Magazine
How to Identify Your Casio Watch Model Number
How to Identify a Fake Casio Watch - Original Casio Watch for Sale | Casio Watch | Casio Watches Philippines | Casio Gold Watch | Casio Vintage Watch | Gshock | G
Is this G Shock fake? Can't find any serial numbers on the back of it and on the inside. : r/gshock