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.
Inexpensive; made @ turn of the century, 40-100 USD or so
50-150 USD
Store brand, inexpensive, utility grade, 40-90 or so
Most like a utility grade store brand shotgun made at the turn of the century or there about. Try internet searches, the library, gun shows, gun shops.