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In recent times this information has also been reproduced on the barcode label stuck to the outside of the speaker packaging.
If you can track down the date code, simply refer to the following set of tables, which provide an accurate record of the date codes used throughout the years.
I pulled this information from Google's cache of the site.
It is important to note that parts do not always contain EIA codes, especially those parts from the late 1940s and early 1950s.