Taking off the current case would be advisable if it will damage the engraving tools. I admit the gun is not valuable enough to engrave but let everyone do as they please. To re-case the action think about just case hardening without any color. The original case hardening back in the 1700's was a sort of pewter gray and I think Brownell has a free pamphlet on a French Gray finish- which ought to look better with the engraving.
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