The spur isn't attached. The middle section of the call is the actual leg from the gobbler with the spur intact. I just sawed it, took the skin off, and then cleaned it off. The mouthpiece and the end of the call are bones from the wings.
The finish I put on all my calls is called "Flexcoat". It is he same finish that custom rod builders use to finish their builds. Flexcoat takes about 6 hours to dry and has to be slowly turned while drying otherwise it will sag. Sort of a touchy finish to deal with but it looks great and will add a lot more protection to the call as compared to a spray finish.