As with any firearm, it is not possible to accurately appraise a gun without seeing it. Recommend that you see a local gun dealer for an appraisal. You can also do your own investigation by looking at other models being sold that are in the same condition as yours. Try the gunbroker.com or a periodical called "The Gun List" You can also reference the Blue Book of Gun Values which can be purchased on line at various retailers.
50- 300 usd
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
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.