A Dell SK-1000RS has just come up on ebay UK
here, it may well be earlier than or comtemporary to the AT102 as it doesn't have any windows keys. It looks a bit like the quiettouch but doesn't have the logo.
Looking around it appears as it might be the Silitek Space Saver
SK-1000R, but unfortunately Dell's site doesn't list what switches it uses. It does list a 'Keycap pull-up force: 1 kg (2.2 lb) minimum" so I wonder if it might use Alps, but does anyone know for sure?