The actions operation.
0-60 usd
A single shot pistol, a Derringer and even a revolver are technically NOT considered semiautomatic. To be semiautomatic, the weapon would need to use the energy from a previous round to cycle the action. Revolvers use the muscle energy of the shooter's finger to revolved the chamber.
50-100 USD
shotgun, rifle and pistol.
Yes, Coonan is one.
Check the receiver and barrel
50-1000 or more depending on the specifics.
Depending on EXACTLY what you have; 100-1000 USD
What model?
Probably not. However some pistols can be fitted with an aftermarketlaser sight.
50-100 USD
Impossible to value with only the serial number and no other details.