The 'El Condor' pressbook is full of surprises.
There is a completely unusual, detailed story about KIT WEST in it!?
I have browsed through numerous of western movie pressbooks from different distributors, 
nobody mentioned the Special Effects!
This is undoubtedly something special.
Pressbook
Kit West, the 'Master of Special Film Effects', Valle del Buho (Tabernas, Almeria).