Shimano’s Dura-Ace groupset was created for the US market - see how the ‘first use’ and ‘in commerce’ dates are the same - indicating that the first use of this trademark was in the US.
I love the angular typeface - which looks good even today. Time for a come-back.
Browse associated derailleurs.
Shimano Dura-Ace (7100) 1977
Shimano Dura-Ace black (7100) 1977
Shimano Dura-Ace EX black (7200) 1978