Welcome to the forum. Is there a C or K prefix to that serial number? It might be separated from the numerical portion by several spaces.
Can you give us other info like barrel length, fixed or adjustable sights, are there patent dates stamped on the top of the barrel, and is there a S&W trademark stamped on the frame? If there is a trademark, is it on the left or right side?
We can help you date your grandfather's revolver, but we just need a little more info to exclude the incorrect answers. Please post a photo if you can.
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David Wilson
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