Early A/B 206's
The early AB206's (the only examples that I really got to know well) were indeed noticeably different from their Bell cousins. I remember that, a) the sheet metal skin on the rear fuselage, below the engine, was a thicker guage (I didn't know/remember about the magnesium tailboom skin), b) the rotor brake used system pressure, not a master cylinder, c) the engine anti-ice valve was activated by a push-pull cable, not an electric actuator, d) rain gutters over the doors were standard from scratch, it took Bell some time to copy this simple and highly desirable feature, e) a windscreen wiper kit was available although I only saw this a one machine, in Italy, but I cannot remember the operator and finally, f) the one difference everyone is aware of is that the pedals are embossed with 'Agust-Bell'. I'm sure there were more differences, but these are the ones that come to mind.