I am looking for help in valuing an Airsporter MK. 2 that I had intended to get working but have finally realised that I have too many other projects. There is the normal collection of marks and minor blemishes, let's call it patina, but overall it's in good condition for its age. It cocks with no rough noises, but the trigger sear spring is broken so it can't be fired. I have no idea of the condition of the seals or internals. The pop up loading tap mechanism works, and there is no play in the movement. I think these have an issue with the stock cracking but I can't see any evidence of this. Any guidance from the collectors would be appreciated