Hi Al,
Halo means the slight fuzzy outline of marks stamped on the pistol after it has been blued. Looks like a hazy border around the number or mark. Most noticable around the ser# stamped on the bottom of the barrel on pre early 1937 Lugers that have not been reblued. A reblue will not have the halos.
When the numbers are stamped on a blued gun. The metal around the edges of the stamp will "up-set" or be forced away. The result is that the blue will be thinned around the very edges of the indentation made by the die. Causing a pale satiny border around the number or mark.
Ron
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I Still Need DWM side plate #49... if anyone runs across a nice one.
What ~Rudyard Kipling~ said...
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