Dating celestion speaker codes
Celestion then makes those in the UK because it isn't practical to make their smaller orders over in China.
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Only the Heritage, Blue/Gold, and Creambacks (plus some custom speakers for some amp companies) are still made in the UK, as far as I know.
I got this information from the Celestion rep directly.
The codes are added on the production line and are placed on the speaker's housing leg or the magnet edge.
The following lists provide an accurate record of the date codes used.
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I had always thought that the V30 magnets were changed to allow for a lower-cost V30 in China.