Ideal Blackboard Stencils

I am seeking additional information and price estimates for these intricate blackboard stencils from Ideal School Publishing Co. Chicago IL circa 1910s (I think). They are really something special, and from what we can tell so far, incredibly rare. I know these were designed for K-1 and illustrate classic Mother Goose nursery rhymes. They are super hard to photograph due to the delicate pinholes and intricate design.

These belonged to my grandmother or her sister and have been hiding in a trunk for close to 100 years.

* Boy Blue
* Four and Twenty Blackbirds
* Miss Muffet
* Hey Diddle Diddle
* Pussy Cat
* Jack & Jill
* Mistress Mary
* Little Bo Peep
* Little Pig Went to Market

Any assistance will be appreciated!