"Framont Incabloc" silver and gold Pocket Watches - 60's

My aunt gave us these pocket watches to my sister and me (The silver one to my sister and the golden one for me). I think they're not truly silver or gold, but I still found them very pretty, and they have an important sentimental value. I remember them since I was a little girl. The silver watch belonged to my aunt, and the golden one belonged to my grandma who died 6 years ago. Both of them were a gift from my grandfader.

I don't know much about them, only that they must be from the 60's and they are Swiss Made.

I would like to clean it, specially the silver one. Should I? And how?. I appreciate any advice or information about them!.

Thanks for looking!