GIN is when you have no bids on your auction and you are allowed to set a certain amount the buyer would pay and if they click GIN then they win the auction and the bidding is closed :) If you already have bids you can't set a GIN though.
Is there anything wrong with it at all? Does everything work well, any noticeable stains etc? Would have liked to seen more pics but other than that it's a pretty neat wallet :D