This decoder will allow you date your Fender acoustic guitar by entering the model number. As far as I could see there is no serial number related information about old Fender acoustic guitars available so the best way to narrow down the date is to use the production dates of the model. This tool contains the approximate start and end dates of the production runs of over 180 models from 1963 to 2008. Included in the list are acoustic, classical, jumbo, mandolin, 12 string and ukulele. If available a link to the user manual will be shown.
For details of what is in my database click here. To decode the serial number of a Fender electric guitar click here. A handy generic fender acoustic user guide is available here.