Unusual 1800’s Child’s Eye Glasses with a Very Old Metal Case

An unusual circa 1800’s pair of child’s eye glasses with a very old metal case. what’s unusual is the end of the two arms on the glasses have a loop on each end to apparently attach a line around the back of the child’s head so the glasses would not fall off. the glasses are a little dusty and are in nice condition. the metal case is dusty and has some old small dents and appears to have had at one time some cloth inside the case to protect the eye glasses. the glasses when folded are 4 x 7/8 inches in size. the metal case is 5 ½ x 1 ½ x 5/8 inches in size. please see the other vintage items i have listed on ebay. thanks for looking.