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Celestion date codes are located on the front gasket, the chassis, or a magnet sticker.
To date your speaker, simply find the pair of letters within the date code – these represent the month and year of manufacture: Then use the reference table below to decipher them.
Genuine stamps would be on the front gasket (as in the previous photo above) until April 1968. The faint ink can sometimes make them difficult to read.
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All Celestion date codes contain a pair of letters representing the month and year the speaker was made.
In most cases the first letter represents the month, and the second letter represents the year.
These inspection numbers can be ignored for dating purposes.
From around Dec 1987 to April 1990 – the date code, speaker model, and inspection number are joined together in one continuous line.
Notice the large font size and white manilla paper gasket. The font size is reduced from around mid 1965 onwards.