Hi everyone,Nubie here. Just bought an Accordo RS. Questions:1. When did the RS designation get added to the Accordo and what does it mean. I see the RS on other models as well (Le Mans, Elite, etc). My guess is that it is meaningless other than it signifies continuation of the model into additional years of production?2. The number stamped into the underside bottom of the down tube appears to be 7FF7315. This number does not fit the scheme I have read about. Given that I haven't read much of this thread can someone tell me if this is the spot for the serial number and if so, am I somehow or another reading it wrong.3. Frame has decal "Tange Infinity CrMo tapered double butted tubing." Guessing that this bike was mfg'd in 86 or 87, is likely that the entire frame is Infinity tubing or just the main triangle? Thanks,Larry