Webley service mk2 valuation please?

[Sniper999]

Hi chaps I need to thin down some of my air guns. I’m not a collector so I’m not familiar with prices.
This is a service mark 2 as per pics
The marks on the stock, I don’t think the top one is a crack??
The under one I think is but the stock is not loose.
I have shown the back of the trigger guard as well, should the serial number be there?
There is a number on the barrel which is 4867 would this help date the rifle?

Loads and fires fine.

Any help appreciated
Sniper

http://img696.imageshack.us/i/img4151b.jpg/