Stumbled upon a listing for the GWG1000 which stated the following:

Display Flasher
A light diode flashes as soon as an alarm, a countdown-time or the hour signal has been reached.

I'm assuming this is bunkum as my GWG1000 doesn't do this (or, does it need to be enabled and I've missed it in the instructions LOL)

https://www.thegoodwillout.com/casio...-1000-1a3erltd