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This isn't going to be exact, but it will give you a "ball-park" age.
And remember, even the dates indicated by the pots aren't that exact.
The best way to date your vintage guitar or amp is from the manufacturers serial number and then use this guide as a reference to date the parts that make up said guitar or amp.
Dates and source codes to help aid and determine the age or year of production of your vintage guitar,amp or other electronic instrument. Source-Date Codes On American made vintage guitars and gear, the pots and speakers provide an excellent opportunity to date a piece of equipment by referencing their "source-date code".
Serial numbers were stamped on the back vibrato cover plate on early `50s Stratocaster® guitars, and on the bridge plate between the pickup and the saddles on some Telecaster® guitars.
Serial numbers with an "S" prefix denote the 1970s (signifying a CBS attempt to use serial numbers to identify production years); an "E" prefix was introduced in 1979 to denote the 1980s. instruments with "V"-prefix serial numbers is to remove the neck and check the butt end of the neck heel for a production date, which may be stamped or written there."N"-prefix serial numbers denoting the 1990s were introduced in 1990.
As seen in the overlap of numbers and years, even these references to actual production dates are rather loose.1982 saw the introduction of the U. Vintage Series instruments and "V"-prefix serial numbers. The numbers and decals were produced far in advance, and some N9 decals (denoting 1999), were inadvertantly affixed to some instruments in 1990. American Deluxe Series instruments use the same dating convention, but with the addition of a "D" in front of the "Z", i.e., DZ1, DZ2, etc.
The source-date code found on pots and speakers gives the manufacturer and date (roughly) when the components were made.
It may have been some time before the part was installed at the factory, but it still provides a good approximation of when the gear was made.