The floorplate tarnish on a Model 21 is a sign of original finish. Any reblue that I am aware of will not tarnish like the original and will be an obviously refinished gun. I do not reblue the floorplates of my 21s for that reason. Prewar Model 12 receivers exhibit the same tarnish as Model 21 floorplates. You will have to read Schwing to get the technical information on the type of finish used on these guns.
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