Condition, condition, condition, followed by condition, age, accessories, box, papers, etc
The best starting place is Bluebook of gun values. It is in it's 31st printing and gives the seller and buyer a great starting point for negotiations.
http://www.brownells.com/.aspx/cid=0/k=bluebook+of+gun+values/t=P/ksubmit=y/Products/All/search=bluebook_of_gun_values
100-500 or so
About $80.
It all depends on which country you are in. Price varies by a lot between Canada and US. Also, its very hard to give you a price on used firearm since age and condition of the firearm affects the resale value. Can you provide more information?
Need serial number to date most any firearm. Check Browning's website under customer service, then date your firearm. Value is determined by condition of firearm, and area of the sale.
At $100 I would suspect that the firearm is either stolen or has been used in a crime. I would be highly suspect of such an item. The normal retail price of a new firearm is well over $500, and a good used price would be $350 or better.
Need date of mfg, serial number, and condition to price most any firearm.
A shotgun is a firearm. A revolver is a firearm. A pistol is a firearm. A rifle is a firearm. If you want even more specific -- A Remington 1187 is a firearm (shotgun). A Smith and Wesson 686 is a firearm (revolver). A Sig Sauer P226 is a firearm (pistol). A Colt 6920 is a firearm (rifle).
If the firearm is in very good condition, it would be valued at $150. If it is in fair condition, it would be valued at a price close to $75.
No, Sword is not a firearm.
The value of a firearm will depend on the specific model, and the condition of the firearm. Some models are more desirable than others, and will command a higher price. A "new-in-box" gun is worth more than a well used firearm. Ruger makes both 22 rifles and 22 pistols- which command different prices. You have not provided enough information to answer your question.
You do not use the serial no. You use the model number. You can purchse a current copy of Modern Gun for current firearm values.
Design of the firearm