That is indeed the zinc core you are seeing, but it isn't MD. That's called split plate doubling. See here:
http://www.error-ref.com/split-plate-doubling/
http://www.error-ref.com/split-plate-doubling/
In Memory of Crazyb0 12-26-1951 to 7-27-2020
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In Memory of Tootallious 3-31-1964 to 4-15-2020
In Memory of T-BOP 10-12-1949 to 1-19-2024


















