Navajo Sterling Silver Butterfly Concho Slides - Vintage 1960s Stamped - 36.4g For Sale

Pair of vintage Navajo Butterfly conchos or slides are made of stamped sterling silver. They are unmarked, which is not unusual for Navajo jewelry from the 1960s or earlier, which is when I believe these were made. I tested both of these twice and each time they were positive for sterling silver. One measures 18.4 grams, while the other weighs 18 grams. They measure approximately 2-3/8 x 1-5/16 inches. The loops soldered to the backs are made of copper.
VG vintage pre-owned condition with some tarnish and light scratches from wear. I have not polished them because some people prefer the patina, but I did test polish a small area of the back of one using a Sunshine cloth and it shined up easily.