I purchased my '75 GR last year from a gent in Wrigley-ville. It's silver and black, just like yours and also in immaculate condition. It came equipped with Michelin Elan 27x1-1/4 tires (which is catalog correct) and appear as tho they may be original. Everything else on the bike appears to be catalog correct, also, so I suspect it's only been ridden a very short distance. Even the clear coat on the yellow paint is very minimal (silver Motobecanes almost always had yellowing of the clear coat, usually most noticeable at the tube intersections). Lovely bike!