BSA made several different air rifles. Unfortunately you did not state the model number and that is critical. You could try to contact BSA and ask them. see the link below.
The BSA Mercury was made between 1972-1980
BSA cadets were made between 1946-1959
What condition is it in. That determines the value.
There are a number of places that an individual can find BSA rifle scopes. Some of the places you may want to try include BSA Optics and Air Rifle Scopes.
The BSA Mercury 22 cal was made between 1972-80. It fired at 550 FPS. I am unable to state the value, you did not state the condition of the rifle. Excellent- Poor?
This model BSA (UK) was made between 1948 -1959. It came in both .177 or .22 cal
It was made between 1948 - 1959. That's all the information I have. You could try the link below for BSA.
BSA made 8 different Meteor model rifles starting with the MK1 to 6, MK 6 Carbine and a Super. Identify your model and state the condition of the rifle to get an estimate of value.
No sn data available
No sn data I know of
I suggest you contact BSA Directly at the link below. They may be able to help you.