Thanks to the nerd watch forum I found this site.
The Wayback archive has a site devoted to older Casios early 90s and before, including Gs, archived. Lots of info, including manuals that otherwise are not availble or in German only.
By the way is there similar info about Casios from the early to mid 90s available?
The second most popular Casios to be collected seem to be calculator watches, does anyone on the forum collect them, just curious?