1997 LMC Planchet Question

I know it is probably impossible considering the 1997 proofs were minted in San Fransisco, but is there any way there could be a business strike 1997-P on a proof planchet. I just went through a bag of 1997-P Lincolns I separated over a year ago. (Finally had time.). I had probably 150 to look at for the double ear. This one stood out like a sore thumb. It resembles a proof planchet a lot. It has a deep strike all the way around on both sides. The rim is, for the most part, flat and squared off. Also, the edge is the same way, flat, squared off, and rather thick. The only thing missing is the mirror-like finish. It is circulated, but there is still some luster present and it is that of a business strike. I don't know, this thing just stuck out. Thanks guys and gals!