My thinking is that the Turkish gun sales demonstrate a market for doubleguns not being met by American makers. The price range is $700. to $2000. for nicely embellished guns. Perhaps there is a market for "field grade" solid American gun among these buyers. I know I would be interested in having such a gun. I own several "american classics" and none have choke tubes and wood less than 90 years old. If Sterlingworth engraving and case colors would make it more profitable, very well. I guess I just want to see an American made every mans gun again. But I am perhaps unique in that I like very basic type guns like Beretta's Essential, just blue and wood.
Based on the 1926 Sterlingworth price of about $45. I extrapolated to get a 2017 price of about $1600. I admit this is not economist accuracy and certainly discounts retooling costs. But wouldn't that be something!?
I think your close on your estimate and there would be no "retooling cost" as a Sterlingworth would use the same receiver as the graded guns, minus the engraving & scalloping. Probably the main reason is that the manufacturer wants to make a lot of profit per gun, instead of a little. It always comes down to money!
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