Your gun appears to have been restocked with a lower grade stock. That German Silver shield in the toe-line of the stock was a feature of the VH, PH and GH quality guns. The Quality DH got the drop-points on the stock cheeks and an oval-shaped silver shield --
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Quality D.H. Ejector Catalog.jpg
The home page shows information available for a research letter on your serial number, so perhaps a letter might address the restock.