It's not possible to answer the question as asked. There are too many types, models and variations of these guns to consider. These guns can sell for as little as a few hundred dollars up to thousands, depending on what it is, when it was made and condition. Condition is everything when appraising a gun. As always, it's recommended that you have it appraised at a Gun Shop or qualified professional.
Need a detailed description
The W818878 is not recognized. 70B30095 is a number for a Browning Lever action .22 rifle. Use the link to find value
We need the model and condition.
700-1000
50-375 usd
50- 300 usd
Impossible to answer without knowing at least which model.
50-2000 USD depending on specifics
50-250 usd
50-300 usd
Try the auction sites to see what they are bringing
Basically impossible to value with just the serial number.