https://www.youtube.com/watch?v=gmQC9o__YRI
https://audio-heritage.jp/TANNOY/speaker/iiilzmkii.html
The Tannoy LSU/HF/III.LZ/8 drivers were made - to my knowledge - with two different chassis. This version with an extra wide chassis allowing the driver to fit in with a 12" front panel cut-out. The shortest diameter is 305 mm. The active cone diameter is 210 mm.
The rounded metal fillets holding the corrugated paper surround were slightly corroded, suggesting the driver has been kept in a rather humid environment. The metal fillets were removed, sanded clean and given a fresh black spray lacquer.
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