Thanks for the tips guys..
my dad also had a merc monterey that had a power rear window..the whole rear "windshield" went up and down
real cool ..at the time...it had a 390 V8 rear wheel drive..that i wrapped around a huge post
When I returned..my dad..who got thru six yrs of WWII asked only...if i was ok..
A "favor" i returned 40 yrs later when my son...caved in the front end of my beloved Merc Mystique
thanks
Canada Doug
guess it was called a breezeway back window.. Mercury Monterey Breezeway with the electric back window