A really awesome on-the-ground website for information about specifics in collectibles was allexperts.com (now defunct). They got bought by something about.com

A really awesome on-the-ground website for information about specifics in collectibles was allexperts.com (now defunct). They got bought by something about.com who then got bought by a Thought Company? and they straight up deleted all of the 10+ years of people asking common questions about collectibles and getting solid answers. Poof.