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It is a 12 gauge shotgun, not a rifle. Retail value will depend on condition, but typically is in the $75-$125 range. As your grandpa's gun, it is priceless.
Highly unlikely you will find anything. Being that old, any existing manuals are long gone, if there were any in the first place.
Sounds like one of the hundreds of store brand guns made around the turn of the century. Value seldom exceeds 100 USD.
The Long Long Trail - 1929 was released on: USA: 27 October 1929
$600 all day long
50-100 USD
50-100 USD
No such model made by Savage.
Western Arms Company was a division of Ithaca that made inexpensive shotguns that appear identical to the Ithaca made Lefever Nitro Special from 1929 to 1946. Yours was made in 1932. Only 400 guns Western Arms Long Range Guns were produced that year, the worst of the Depression. Single trigger versions range fro $150 to $400 in useable to excellent condition.
The 12 gauge long tom 1900 shotgun by Sears and Roebuck is valued at $250 in excellent condition. In fair condition, it is valued at $80.
100 USD or so, max.