1967 date code
small rectangular decal reads:
418 TYPE DIA-CONE
Part no 21442
Impedance 10 ohms
Altec Lansing 418 and 418-8H Photo #817579 - US Audio Mart
early 418.jpg
Here's a beautiful pair, 1969 date code, in 4 ohms:
MATCHED PAIR ALTEC 418 15" 4 OHM ORIGINAL VG CONDITION SPEAKERS | eBay
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