I know I posted about the other planes, but I forgot to mention the Stanley No. 12 I picked up for $40. It is in fantastic shape! I read that there weren't really identifiers to show variations as once the design was out, it was a good one that didn't need to be changed. Mine does have an "81" stamped behind the blade...not really stamped, as they are raised numerals. Any ideas as to what it may signify or a way to date this beauty?