There was no variation at all in the process for the grades of gun. So the effects will not be any different except for the normal variation from gun to gun.
Now, the appearance can look a bit different due to increased amounts of engraving. Meaning that colors and patterns may not look as clear or vivid. But usually one will not see a major change in appearance until you get into the grades with more full coverage engraving and deeper engraving.
The SC trap guns with all the stippling on them are a perfect example of a surface that can hide a lot of case color.
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B. Dudley
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