Chinese are Mk2 I believe and were variable in quality in regard to optics. The front objective should be 56mm though and they definately came in 8-40 NOT 10-40. Assuming it's a 8-40x56 and not a 10-40x50 something else then £220-£250 if the optics are good for the scope only. Add more if you've got mounts and big sidewheel etc.