VGC Shimano RX100 Mini GROUPSET Crank + Front Rear Derailleurs + Shifter (GA) | eBay
Vintage Shimano - RX100 rear derailleur on the vintage Shimano service bench. These are basically identical to 105 1055 apart from the polished finish. | Facebook
GUIDE: Repairing Shimano RX100 (A550) STI Levers - Bike Forums
FS SHIMANO RX100 GROUPSET (WHITE) IN GOOD CONDITION*REDUCED* | Retrobike
Shimano RX100 Rear Derailleur | With Campagnolo Super Record… | Flickr