This vintage pair of sterling articulated fish screw-back earrings was made in Mexico. They're just over 2 inches long with no damage. Marked on one tail fin MT 925. The backs of the hanging balls are more thoroughly marked but they're faint and almost impossible to make out with the tiny print, even with a lighted loupe. There is definitely a heart symbol, a likely name of the artisan, and letters that appear be to HNSD or IINSD. I was unable to get a clear picture.