Massey large Duplex Slate by Haenchen: no longer made

Ed Massey was a genius! This is one of his greatest inventions. Imagine this:

A school type slate is passed out for examination.  It and a piece of chalk is dropped into an envelope.  The spirits are contacted and when the slate is removed there is ghostly writing on both sides (or one if you want).  It is one of the most cleverly built props ever.  No longer available. Hallmarked Haenchen.  The slate 10×7.5 inches.  This is brand new. I removed it form the original wrap to photograph.

Estimate $150-250