Regrettably not pictures of one that I own (maybe one day) but a great piece of Louesque research over on WUS. http://forums.watchuseek.com/f27/zenith-espada-chronograph-overview-1972-75-ref-a7817-01-0040-418-a-816544.html
Not sure why the link isn't working - let's try again http://forums.watchuseek.com/f27/ze...w-1972-75-ref-a7817-01-0040-418-a-816544.html