date stamped lincoln.. test coin ?

Help !!! I came across a very interesting penny yesterday.While I was searching thru a large pile of loose change, I noticed a lincoln memorial that stood out as gem unc w/ more of a yellowish copper colored appearance and maybe proof like. I put the coin aside to card it off today. When I carded this coin today,and looked at it under magnification,I noticed the coin was date stamped 12-31-74 above the coins 1975 date. So, if anyone has any info about this coin ,please answer my post.I would greatly appreciate any knowledge about my penny!! Happy collecting and keep checking ur change, SKYCOINS

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