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Help with driver ID?

Markoneswift

Quartz locked n ready to rock
Hey all, I'm restoring a very early pair of IMF ALS40s and I'd like to ID the midrange drivers. They work OK but the surrounds are giving way, so I'd like to try and find the correct replacements.

The marking on the back says CPM 8 and Made in Gt Britain, with a date code around 1972 I think.

Thanks for any help as always :,)

Screenshot_20230531_185925_Gallery.jpg 20230528_181558.jpg
 
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