Dating celestion greenbacks
This was very common during the creamback period, and trips up a lot of people.These are real heavyweights - cast iron frame, thick paper cone, and sturdy terminal board. This is generally only designated however on units that have Celestion's own label.Speakers have been used for quite a while, so give an incredible sound.Perfect if you want to achieve that original Marshall tone. Vinyl cover included to protect during transportation.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.The pictures come from this thread (requires one to sign up to the forum).
Marshall Vintage 1960A 100W Cab Cabinet 4x12 Celestion G12 M Greenbacks 4x25w Made in England.
Produced by Celestion for Vox (initially exclusively for the Foundation Bass cab). Above, an early Celestion 18" T1022 in 1964 Vox blue from a Foundation Bass cab that was apparently beyond saving, along with a T1079 from a slightly later cab, long gone.
The dust-caps have rubber trim to dampen vibrations. Both of the above are 8ohms, however, which may indicate reconing.
Below, one at home in a Marshall bass cab: T1200 A G18C 8ohm version, bass resonance 45hz.
Of a similar speaker, "Dr Decibel" of Celestion stated "The 18 is a G18-200 or 250.