Signed painting

It appears to be painted on leather. I can't be sure of the signature. It measures approximately 2' 1.5" X 1' 6" without frame and matting. I'm guessing that the painting is only an inch or less behind the matting. Also the top part has some kind of heavy and slightly mottled tan paper that looks like it has slid out of place. Someone some time ago told me it was part of a 3 part set. Any help identifying this piece or the artist would be greatly appreciated as it was my brothers and he recently passed away. I think he found it at a Garage sale as that was a hobby of his. The signature looks like Johnny but it could be J something. There is nothing on the back. Stiff Cardboard type backing.
Thanks for any help,