The gun was made in 1949.
...a bit of advice,
Don't ever dry fire one of these guns.
The firing pin assembly was poorly designed and they are prone to bending and breaking.
Replacements are impossible to find.
You can find out what year your gun was made by having an expert appraise the gun. You can also find out by finding the model number and contacting the manufacturer.
Made by WHO.
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Not without knowing who made it.
The gun was made in 1919, nice find!
Find all the books you can on who made it.
You will have to provide the name of who made it and what model for anyone to be able to begin to help.
Try gun shops, gun shows, pawn shops, want ads.
Try want ads, pawn shops, gun show, gun shops
The only way you could find anything about that gun if it doesn't have any defining characteristics on it is to take it to a licensed gunsmith. There is a distinct possibility though that this is a custom made gun, and not done by any brand and therefore not having a model, so no model number.
You will have to call S&W with the sn to find out.
Gun show, gun shop, pawn shop, want ads