S/N 140743 -5 screw ,5" barrel sq service grips /with out medallions.made in USA on right side of frame ,last patent date Dec 29 14, 32/20 right side of barrel, smith & wesson on left side of bbl. finish 90%
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age is just a number

That would be very late production, late 1920s (1927-28) most likely. Production ceased around 144000. Can't be valued accurately not knowing precise condition. Although the .32-20 M&Ps are much less common than the M&P in .38 Special, there is not much of a price premium attached to them, primarily because .32-20 ammo is somewhat difficult to find and can get expensive. In average condition, maybe $300-$400 at retail. If truly 90%, add another $50.
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Looks like this is a duplicate of another posting.