Second models were cataloged as ten inch, but many left the factory with first model six and eight inch barrels. Six and eight inch are scarcer than ten, nickle is scarcer than blue. Stocks can be extended hard rubber or wood. Front sights were often replaced and, in my opinion, a period Marbles or other sight does not affect the value. Serial number should be on the rear of the barrel and latch. Good luck.
Bob
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