gm photo negitives

[mech1]

hi looking for imformaion last year i picked up what i would say are negitive of gm cars 64- 69 they apear to be shots to be used in adds fo gm some have shots of car with interioer opions next to car some of car with people some one told me that when went to dealers in 60s they had display to veiw
these but ive seen many thing goining to meets but never any thing like that i would post pic of these negitive but
dont know how i would show them amy info would be apppriciated