Could it be a setup die tool?

Friends,

I was doing some pics of my Lincolns of which the proofs were too dark and the business strike were too bright. They will all need a redo but in the task I found something cool on the reverse of the 1974-D. It seems to be a plate or tool with the number 22 in the center of it. Left on the die and compressed into the reverse before making this Lincoln.

Rick

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