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Note: You might have read elsewhere that the month codes changed in 1963.
This is incorrect – they always went from A to M, skipping the letter ‘I’.
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.
From around Dec 1971 to Sept 1972 the day of the month is usually omitted: From around June 1976 the inspection letter is no longer included.From 1986 onwards a two digit number is normally used instead.The code beginning with the letter ‘T’ is the model number of the speaker, for example ‘T1281’ represents a 55Hz 16 Ohm G12H.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.
Occasionally they might be printed on the outer rim. An additional inspection letter is usually included (except Aug 73 to Jun 74), these can be ignored for dating purposes.Notice the large font size and white manilla paper gasket. The font size is reduced from around mid 1965 onwards.