It's a cool site though not always accurate.It's been posted before a few times.A much more useful one,IMO,is Alloy Artifacts,
http://home.comcast.net/~alloy-artifacts/ It's got info about many different brands and is very accurate.If your into Plomb tools this site is fun-
http://plombtools.com/default.aspx And for the Bonney guys looking for info here's a Bonney date code chart-http://www.vintage-trek.com/bonney_tool_date_codes.htm
Any other good collector sites out there?I know most of us longtime members have seen these but I figured I'd post them for the newer members who may not know of them.