One was shown on the Vintage American Airgun forum about five years ago, John.
The gun was a near perfect copy of the MK2 service except it had a plastic stock.
I'll do a search later to see if I can find the thread.
Edit - found it :-
http://www.network54.com/Forum/40594...5/+View+Thread
And an advert :-
image.jpeg
All the best Mick