50-350 usd
Date code stamped on left side of barrel, go to Remington Society of America for diagram and chart.
It is a St. Louis Browning made by Remington for Browning. It was made around 1940. It's value is probably around $250.00 without seeing it. The B means it is a 12 gage. A was 16 gage and C is 20 gage.
Value of 75 Cherokee 12 gage single shot
50-100 or so
Not marked, Model 9
Starting in 1921 Remington date code stamped all it's firearms on the barrel. You can look up the details on location and the code table on the Remington Society of America on the Manufactured Date link.
Check this page on the Remington Society of America for a list of places: http://remingtonsociety.com/rsa/service
25-100 USD
50-100 USD
Impossible to value with just the serial number.
Sounds like a model 11, 1905-1947.