What kind/style of glasses are these?

[FedoraFan112390]

I think my grandpa has a pair of glasses in his shirt pocket; It's hard to tell because of the low resolution of the photo but that's what it looks like to me. If so, could anyone try to help me deduce the type/style they were? He wore reading glasses. The year the photo was taken was 1972 though he may have worn glasses for several years before that since he was 52 at the time.

For large version
http://img403.imageshack.us/img403/3048/july19723a.jpg