My 1920 DWM (property date?) has the rust-blued sight blade, a perfectly aligned front sight witness mark and a "1" on the muzzle end of the sight base. The rust blue matches the rest of the pistol. The sight blade shows no indication of filing, but German armorers were extremely good and you can't always find evidence of their work.
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You can lead 'em to the water, but you can't make 'em drink.
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