Heinz,
If you re-read my original post, I stated "When the barrel is machined, the front sight block is broached from the forward barrel band and then a mark is struck on the rear flange exactly 180�º from the vertical mid-line of the sight block (or exactly perpendicular to the horizontal plane of the sight block if you want to look at it that way)". I was trying to indicate that the mark was struck as a reference after the front site block was machined, not before.
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If it's made after 1918...it's a reproduction
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