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So ‘GB17’ on the photo above = 17th July 1969 (ignore the ‘Y’). More example date codes are shown further down the page. If you are struggling to date an old greenback speaker using the Celestion date codes chart above then my blog post how to date vintage greenback speakers should help you further.
You might have read on the Celestion website to use the stamp format to date your speakers. For example a ‘DB’ date code on the frame leg would be translated as 1969 if it was in the format MYDD, or 1992 if it was in the format DDMY.
However, I do not recommend using the stamp formats as the main basis for dating your speakers.
The problem is, Celestion were not very consistent with them and this confuses a lot of people: I have included the stamp formats in the year column headers on the chart if you want to use them.
The 6 digit code indicates what manufacturer made the speaker and when it was made. Here is a list of some of the speaker manufacturers and their EIA codes: So, the speaker in the image above would have been made by Jensen (220) during the 27th week of 1951 or 1961.
The year is confusing because it is only a single digit.
Unfortunately, this means you can't get the full experience. This page is a collection of odds and ends information relating to speakers and speaker implementation.
For 12″ speaker models, use the stamp location colour codes to guide you.
If you need more help, scroll further down the page for a more detailed explanation.
Some manufacturers also attached other letters to the end of the date code to indicate day of the week, work shift, serial number, lot number, etc.
The EIA only specifies manufacturer and year/week code.