You can tell by a couple of things. The Criterium has chromed steel plates added to the body. And the pulley cage plates are solid rather than stamped and hollow-ish looking.
Originally Posted by
Narhay
I need to figure out which derailleur it is. I thought prestige but perhaps it is criterium? It is identical to this one with the red plugs.
Those chain wrap and max cog sizes have to be wrong. 34T?
VeloBase.com - Component: Simplex Criterium