here are some photos of my foreign coins, I have not cleaned them as not sure how to was thinking of using silver jewlery cleaner to soak then running water over them.hope you enjoy the pics.
cooper
The Newfoundland coins could be worth a few dollars over melt, and the New Guinea ones may be worth a dollar or so over melt. The rest are just worth melt.
The reason why they appear darker than most silver coins is because most are made out of debased silver (most of yours look to be 50% silver) rather than more pure silver.