Jay - A replacement stock would have the SN running in the opposite direction as the one shown in Bruce's picture.
Larry - Yes there are a few early upgrades out there that are marked as you describe. Also look for Bob Runge's initials (RPR) in "microscript" also hidden in the engraving tableau, usually at the base of a rock or a tuft of grass. Bob's initials are not always present, however, on the very early upgrades (those done before they began marking them on the watertable).
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