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57 Unknown bolt marking

This is a discussion on 57 Unknown bolt marking within the Early Birds [1955-1957] forums, part of the Thunderbird Model Years category; I removed the bolt from the lower rear of block passenger side that holds the sparkplug separator. Bolt has unusual ...

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  #1 (permalink)   IP: 73.181.115.61
Old 09-17-2020, 07:06 PM
 
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57 Unknown bolt marking

I removed the bolt from the lower rear of block passenger side that holds the sparkplug separator. Bolt has unusual markings...a C with an underscore on the right side top. Also attached by the bolt was a thin brass plate 1" x 2" with the following number stamped on it: 126814. I'm trying to add a photo but not sure I'll succeed.
Does anyone know anything about these?
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  #2 (permalink)   IP: 73.181.115.61
Old 09-17-2020, 07:10 PM
 
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Another photo of the odd bolt
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  #3 (permalink)   IP: 74.135.87.22
Old 09-21-2020, 08:51 PM
 
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Some engine rebuilders, mark their rebuilds similarly. It's usually a metal tag, with their name on it, with a serial number for the rebuild. Sometimes a date, also.
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