Sterling Silver Friendship Ring

I had a great day hunting for silver today. Found 4 or 5 nice piece. This is one of them. Nothing super super special, but for a few dollars I was happy. This ring, as you can see, swings open to three pieces. When it is closed the hands join like on any regular friendship ring. I thought this was different and worth posting. I hope I can distinguish a maker. Anyone know a time period? 70's? Thanks!!!