I think its difficult to pin down the neck profiles to any particular year of manufacture. Ive had 3 79,s a 1980 and present a 1981 Sunburst and the 79,s all had thinner necks than the 80 and 81. I noticed the 80 and 81 had a flatter fingerboard radius (12"?) than the tighter 79,s (10"?) also. The neck on the 1981 is about the same depth as a medium 90,s Hamer and definately much deeper than an early 90,s model. The only thing of consistency noticed is all the early Hamers have narrow necks 42mm width at nut and 50mm width at 12th fret. The latter Hamers are 43mm width nut and 51-52mm 12th fret.