I'm trying to find anything on vintage Piaget watches and scarce would be too lax a term. Does anyone have any good websites or reference books I can try? I want to offer somebody a fair price on one, but I can't find any to compare to (and I know not to ask for any approximations here). I've been scouring eBay's current and completed listings for a couple weeks to no avail. It's a caliber 9P manual wind that looks like a predecessor to the Altiplano series. Any help would be appreciated - can you point me in the right direction? Thanks!