Sounds like a model 14 or 14 1/2 should be able to get a parts diagram from e-gunparts.com if you can't just find it on the web searching.
22 Long Rifle
Sterling of England was purchased by Benjamin air gun co in 1994 (After Crosman purchased Benjamin) The Sterling line was discontinued. The HR81 came in calibers of .177, 20 and .22. if fired at a speed of 700/600 FPS. Unfortunately you did not state the current condition of the rifle so I can not give you an estimate of value.
gunbroker.com Numrich gun parts and gunclip.com
how many dollors will I get for £20 sterling?
It is a High Standard Flite king, made for Sears.
24 pounds sterling
"percent" means "out of 100" → 20% of £520 = 20/100 × £520 = £104
47 pounds sterling x 0.20 = 9.4 pounds sterling
Sterling Fessenden died on 1943-09-20.
Haynes manual #38010 has it and can be gotten at most parts stores for about $20.
i need a diagram of the internal parts of this gun. where would i find it..