In my study of John Graham's different styles of carving, I have speculated as to the dates of his different styles and variations of bill and head carving. I believe that as Graham got older, his "Roman Nose" style carving disappeared. This is only my thoughts and only speculation as I have found no written proof of this. Pictures detailing my study are below. If you have any thoughts or facts to prove or disprove this theory, I would appreciate any input. My email is just2decoys@aol.com
John B. Graham Canvasback head carving from 1840 to 1910:
Early
Early
Mid 
Mid
Late
Late 