It is collect able but I would of only thought of a value of £4-6 the rarest I have found was a hodgeson of ripon which is worth around £20-25 .
yours is like the old eley grouse type and the old Winchester oo buck ones I hope this helps.
I've got a 12g varnished paper one with Holland & Holland printed on it. was given it when a mate couldn't get to feed in his semi auto!
Only h&h I am likely to own!
thanks guys much appreciated.