I notice on the 1971, the bust looks smaller & offset kinda...the other pennies I'm just not sure about... The 1987 looks weird on 1 side too...smaller.
The mint redid the master hubs from time to time. I don't know if they changed the bust size in 71, but if you want to see a major change compare a 1968 with a 1969. They really modified it that year.
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