What is the value of 4-10 12 gage full choke shot gun year 1930 made by bridge gun company. brand black prince.?

Is it a .410 bore shotgun or a 12 gauge? No matter. A Bridge Co. single barrel or double barrel (side to side) shotgun manufactured in 1930 is, in all likelihood, a Crescent City Arms shotgun. This company made many thousands of inexpensive shotguns under dozens of names. Collector value minimum. Practical value depends on the condition of the gun.