i've been offered a used 35 cm birkin, black clemence leather with GH, c letter stamp (from late 90s i think). everything looks to be in good condition except that the 'hermes paris made in france' writing seems to have gone a bronze colour instead of the usual gold. do you think this is a problem or should i go ahead with it? price is very good, from a family friend. no question about authenticity. opinions greatly appreciated.