How much does an import mark kill value?

[sheepherder]

Some are small, unobtrusive, almost hidden. I'd say they don't detract from the price too much. But some are large and garish, and detract considerably.

I have one handgun (not a Luger) that has the importer spelled out in 'dots', like center pin strikes, all along the underside of the barrel, from muzzle to front of frame. Really ugly.