You type in the name of the watch you're looking for and over what period of days and the site will filter and select all watch sites (if any) that have an ad for that model and when it was posted with a link to the ad.
I've been referred to it once before but it's buried in a thread somewhere and I'm damned if I can find it!
Have tried googling a number of terms but keep drawing blanks. Does anyone know the site I'm talking about?! Thanks.