Nice original used inside rear view mirror, Guide  / GM part number 916904.  According to my GM Manuals, this is used on the following models and years:

1971 Chevelle..w/o Map Light

1969-1970 Chevrolet Passenger, Chevelle

1969 Oldsmobile...All models

1970 Oldsmobile..All except Toronado

1971-1972 Olds. F-85

 The mirror assembly is in nice condition and is free of any dents, cracks or  damage.  Some light scuffs on housing. Mirror glass looks good. Some imperfections in mirror but still very usable. Cast on the piece is GUIDE GLARE-PROOF. MADE IN USA. This mirror was pulled from the car in the late 1980's and has been in dry storage ever sense.