No published sn data.
Depends on the caliber. A .45 caliber pistol uses about 40 grains of black powder. Contact the maker's website and download the owner's manual for YOUR gun.
50-150
Call Colt and they will tell you. Proofhouse.com has Colt sn data.
1200
I have provided a link that explains how to claen it in detail.
$100
No published sn data.
10-100 usd
Assuming that you have a single shot pistol, these are worth $75-$100, depending on condition. They are a modern day version of a black powder pistol. They are dated not by serial number, but a 2 LETTER code in a hollow square. Most date from the 1970s
depending on overall condition $150 - $200
Depending on the manufacturer, either Size 10 or 11.
I bought a "Dikar 45 cal black powder only " belt pistol today for $8.00 at a yard sale, What a deal!!!