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560Dennis

Old Spark Plug Identification

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I found this one (spark plug ) in Dad tool box ? What was it for . ❓

i never looked at it close but it has B.G.   And 4B 1  stamped on it. Looks like you can take it apart and clean it ? 

With the four electrodes, wondering if it was for the old marine engines  ? 

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image.jpeg

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