From what I have been able to gather, the 417 came out in 1967. I have a few Magnet cover's that have "417 Type" speaker on the Tag/ sticker,pre dates the 417-B.
If you have an OEM cone of a B or C. I am not sure if there is a difference.
http://www.lansingheritage.org/image...vers/page1.jpg
http://www.lansingheritage.org/image...vers/page2.jpg
http://www.lansingheritage.org/image...-mi/page04.jpg
http://www.lansingheritage.org/image...-mi/page04.jpg
http://www.lansingheritage.org/image...-mi/page07.jpg
Does anyone know the differences?
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