I run across this while wandering the net. I'm one of those people that has to know when something was made. So, I thought maybe some of ya might be interested in it too. It covers guns from 1866 to the 1990's
Follow the link below and you can download the PDF and remember, it's a Adobe PDF file so you will need Acrobat reader or some type of PDF reader.
Winchester Manufacturing By serial number and year.