The letters "SR" do not configure. Are you sure the letter "S" is not a number "8"? Several Standard Weight 16 ga A5's with "8R" preceding the serial numbers were made in 1958. Value is too difficult to be accurate without seeing the gun. Condition which includes the amount of original finish and original configuration will determine value. Auto 5's with recoil pads (other than Mag 12's) poly-chokes and compensators will reduce value. Expect $300-$600 range for this gun. Recommend taking it to a gun shop for appraisal.
50-500 uSD
2,100 dollars
That is a Browning BPS Hunter 12ga made in 1988. Value is going to be $250-$300.
50-500 usd
Blue Book of Gun Values is a good place to start.
100-1000 USD and up depending on specifics.
100-1000 depending on specifics.
40 years old. 100-500 USD
100-1000 usd
If it is a Browning Superposed 12 gauge it was made in 1959.
Check the link for the Blue Book quote
Need more info / what is the serial number