Unless you know the value for b, then you can't, so it would be at its most simplified form.
That is a Stevens 107B. Depending on condition, $75-$100.
The stevens model 107B was made during 1912-1945.there was 443,500 made during this time frame.
The Electric Company - 1971 107B 6-107 was released on: USA: 15 March 1977
The 107B was the predecessor to the Model 94. Singleshot .410s are desirable compared with the larger gauges, but they're still only worth $75 to $175, depending on condition.
The stevens model 107B was made during the years 1912-1945,with a total production of 443,500 guns made during that time.I am afraid that is the best that I can do for you.
value of a 107B 16 gage
e-gunparts.com
Made from 1912-1945.
10,342$
The 107B in 20 gauge is not rare. Even in excellent condition it probably isn't worth more than maybe $125, and in well-used condition can be found for as low as $50 at gunshows.
I dont know age, but worth about $65
Stevens 107b is a fixed cylinder bore. So in other words, no choke and not able to be choked.