Late SL M2AP with odd paint

What’s up with the extra long paint and the cannelure knurling?
I highly doubt it’s a reload but where is the typical dark annealing by the shoulder?
The Denver round on the left is typical M2AP for reference.
I had never seen the brown box before either.

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This is the revised version of the M2 AP projectile with the identification knurling added on March 12, 1941. The paint job is out of spec (should be approx. 9/32").



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