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An extra single letter is apparently just an ‘inspection letter’ and can be ignored.
For dating purposes it is useful to know these are only usually present on speakers made between 1969 to 1976.
The circular quality control stamp changes appearance through the years: From roughly March 1978 to mid 1980 – usually a large letter ‘P’ or ‘Q’.
From around mid 1980 to late 1985 – usually an “insp number” stamp with no circular border.
If you do ever find a letter ‘I’ in your Celestion date codes it is just a typo and should be a letter ‘J’.
The gasket material is made from cork with a thin paper overlay and is made up of 4 separate pieces.
The small circular stamp with ‘insp’ text or a letter ‘P’ inside it, is a quality control stamp.
It is an important stamp to look for to authenticate old ‘pre-rola’ speakers.
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.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.