I would suspect the reason it is 'in storage since new' is it is simply too big for the owner. I agree with OddJob that it will very likely need a overhaul to get some fresh grease into the bearing. $200ish tops, where I live I wouldn't give more the C note for it. It is likely 'rare' simply because the seller hasn't seen another one.
I see they use keywords in Spain too.
bicicleta marca Peugeot con cuadro Carboprofil (especial aerodinamico), talla 56, con 12 velocidades. Esta en exelente estado de conservacion, no hay que hacerle nada. precio no negociable, precio no negociable. Atiendo solo telefono o_____________________ bicicletes segona ma urbana años sesenta años ochenta años noventa 60 setenta 70 ochenta 80 fixi BH rieju bianchi torrotgac Orbea torrot peugeot GAC gacela pinarello colnago battaglin marotias macario otero mavic shimano zeus columbus mendiz olimpic We