Caliber should be on the barrel. SN's were not required until 1968
No published sn data
No published sn data.
100-300 USD
American Bulldog was a name used by at least two different manufacturers. Early guns by H&R date from the early 1900's, but Iver Johnson also marketed a revolver under that name in the 1970's. Johnson and Bye, a predecesor of Iver Johnson, also made an American Bulldog in the late 1800s. These can be identified by an owl's head on the grip.
No more than 100 USD
1991 PX 22
Serial number shows it is a single action revolver made someime after 1978.
if your pistol is of the model 1911 with serial number 189558 then it was made in 1917 by colt. If it is the revolver then the serial number is to high for the 1917 revolver.
On a Colt revolver, the serial number is generally in two places. When you open the cylinder you will find the serial number at the base of the frame & crane.
Anywhere from $10-$200, depending on condition, model, etc.
Impossible to answer because you did provide any information about the revolver or the serial number.