A very strange invention from the last century, these are chicken glasses.
Chicken glasses were invented to stop cannibalisation in egg laying hens.
You can read about the history of chicken glasses in my blog here.
These glasses are made from silver metal, I presume aluminium and have plastic hanging dark pink lenses. There are holes in the ridge where a pin would have been which enabled the glasses to be attached to the chicken’s beak, so they didn’t fall off.
A very strange and unusual farming curio.