This is a really strange little item, it is like a little bottle with a totally sealed glass vial inside and inside the vial is this text.
Chatelaine Souvenir of Thelma Queen of Perfumes A surpassing scent of subtle sweetness. Patented May 3, 1910.
There is no stopper or cork and no hook or chain to hang it on a chatelaine. I don't imagine a little glass bottle would be all that safe on a chatelaine so not sure what this is all about. A gift from my brother. A little over 3 inches long.