6966 is a D6 listed in TPS as a gun for the 1876 show -- see Chapter on Show Guns. The lists of show guns came from special lists that Parker kept, not the stock books or order books (as I recall). Maybe 6966 started life as a lower grade and was recorded as such in the stock book (source of the Serialization data). A study of data in the stock book and order books may help explain. I have never seen a Parker sidelock with such steps.
Charlie Price
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