1964-D and 1968-D pennies

I find a LOT of these, especially the '68-D. The mintage of 1967 pennies is higher than the 1968-D but I rarely see '67s and always see '68-Ds both at work and when coin roll hunting. I wonder why this is?

 

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If you live near the Denver area, that could be partially the reason, and a bit of luck.

 

If you live near the Denver area, that could be partially the reason, and a bit of luck.