New to the forum and have enjoyed the chainsaw information for quite a while. I've been collecting Stihl chainsaws for a few years now but want to get more serious about understanding the intricacies (and versions) of each model. I've focused my collecting mainly to the saws of the 1980s. I currently have 23 working saws. My favorites are the 051 and 075. I understand that serial numbers offer little information for Stihl models, so where can I go to learn more about variations of each model?