It is the front to rear patch of lighter color on the floor plate and is more easily observed on Trojans, VH, and Ph guns where there isn't a lot or any engraving to disguise it.
It is caused by a very minor temperature variation across the floor plate during the color case hardening process.
Edgar Spencer's 1928 VH in pristine original condition.
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"I'm a Setter man.
Not because I think they're better than the other breeds,
but because I'm a romantic - stuck on tradition - and to me, a Setter just "belongs" in the grouse picture."
George King, "That's Ruff", 2010 - a timeless classic.
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