Pacific Arms Corp of Modesto is a firearms importer. US law requires that firearms imported into the US be marked with the name and address of the Importer. Among other possibilities, they were importing guns made by Shooter's Arms.
You will have to carefully note exactly how the gun is marked, first.
First, it is not a machine gun, regardless of how it is marked. Second, most likely made around the turn of the century.
If made before midnight, December 31, 1968, it will not have a serial number. If made later, it will be clearly marked on the receiver.
The cast of The Marked Gun - 1912 includes: Jack Richardson as The robber chief
Your gun was made in 1955. Please click on the link below to figure value.
You will have to call Colt.
If the company name is marked exactly as you have written it, the gun was made between 1920 and 1948. The date will not be marked on the gun and it is probably not serialized so the exact year of manufacture cannot be determined.
You have a "hardware store" gun- POSSIBLY made by Crecent firearms. At one time, general stores and hardware stores carried inexpensive firearms. Several companies made guns for the store chains, and marked them with the name of the stores.
If it is not marked on the barrel, take it to a gun smith for a chamber cast.
The receiver is the frame of the gun. When a gun is marked with a serial number, it is stamped on the receiver. It will be a different part depending on the type of gun.
See the link below marked CANADIAN GUN LAW.
Made by the Crescent Firearms Co. If it is marked as AMERICAN GUN CO, it would be 1905-1922. If marked as CRESCENT FIREARMS is would be 1922-1930.