Shimano Long Reach Brakes

jackhulbert

Retro Newbie
Is there anything in the model numbers of Shimano brakes that identifies them as long reach (49-57mm)?
I'm looking at eighties/early nineties stuff
 
R number today. R450 and R650 but that's new.

Back in 80's 90's I don't think the model number made a distinction. There was say 1055 short and long drop.
 
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