Rare hand blown glass eye from the 1930s

This is a hand blown glass eye from around the 1930s and was made in Germany. The eye measures about 18mm in diameter- but is hand blown so will be uneven in size and isn't completely round. Also- it doesn't have the detail in the iris which the modern eyes have but it is still full of character. It is very unusual to find the glass eye with the stem still attached.