Yeah, 100GS is very rare. 20 GS was more common around 91ish but was short lived. It was close to being a good groupset, let down by fragile trigger shifters and plastic brake levers IIRC.
Never heard of 70GS, but it doesn't surprise me.
I'm no expert, but I reckon this little beaut is around 89-90 vintage.
I guess that's a typo? Probably you mean 200GS?
100GS wasn't really that rare, just not so many survivors which is a testament to the type of gear it was usually attached to and 70GS is basically Tourney with different (still crap) shifters/levers
100GS is all steel and plastic, bad, heavy, bendy stuff 200GS isn't really any better. It's just crap
_________________'89 Specialized Stumpjumper Team
- '8? Klein Mountain Klein (WiP) - '89 Puegeot Scorpion 531 - '90 Look Mi80 - '91 Britsh Eagle something or other XT
- '92 Specilaized Hardrock - '93 Saracen Race Elite
- '93 Specialized Stumpjumper (stolen!) - '94 GT Zaskar LE Frame sold on RB - '95 Univega Alpina 508 XT - '97 Cannonadale Super V 1000 Freeride - '97 Cannondale M900