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A case of mixed dates (11)

Ross

I believe the answer is:

anachronism

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This could be a double definition.

'a case' is the first definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see an association between them that I can't see?

'of mixed dates' is the second definition.
The definition suggests a singular noun which matches the answer.

Can you help me to learn more?

(Other definitions for anachronism that I've seen before include "old-fashioned chap" , "Something appearing in the wrong time" , "Item that could not have occurred when said" , "such as Trevithick going via Eurostar?" , "Thing that belongs to another time" .)

I've seen this clue in The Globe and Mail and The Guardian.
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