Are you sure that's a Gios? The simple details on it kinda make it look like a French bike from the early 70's. Not used to seeing the name "Gios" associated with a bike that looks like this, but maybe it's really old, like you said 60's vintage.......Was "Course" used by other Italian makers as a model name? It's just a name that I might associate to maybe an English bike...like maybe a Raleigh or something...... Turkey leg brake levers look like a later 70's add-on too. Those taken off and a good cleaning/servicing might reveal a nice bike under the grease and dirt.

Chombi