1965 L78 Impala Tachometer

[Rainer]

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Example:
I have a set of NOS 1st design 1970 Chevelle Tail lamp lenses.The Chevrolet parts books say they used part #5963045-LH & 46-RH.The Original boxes show these same numbers stamped on them as well.
When you pull the actual tail lamp lenses out of their original boxes,they have #5963047-LH & 48 on them instead.These two numbers do not appear anywhere in Chevrolet parts literature,yet they do exist and are the proper parts for the 1970 Chevelle application.
This and yours are just some scarce examples of Delco parts numbering anomalys I have seen and heard.

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I'm going to disagree with you on this one, Rick. The numbers you're referring to on your lenses are numbers for individual components that make up the lens. Look on the front side and you'll also see numbers on each of the red rectangular inserts. Those three components together make up the item referred to by the part number, which can be found in the books. The components were never available separately, and thus were never referenced in assembly and parts manuals.

The number on the tach corresponds to an actual 65 tach part number, but with a lower redline. No anomaly here. Also, he mentioned that the indentations in the tach face that are supposed to be at the 10's are not in the right places. I noted the indentations in this edited photo. If you look closely, you can see them. This tach face was originally a 6K version, which corresponds to the part number on the backside.