The ending price of this remarkable pop-up invitation is another indicator of how strong the market is for unusual small paper. I recently purchased a sizable small paper collection out of Iowa. One invitation was from this same set. Also written in, it too had a date of 1925. Because I have never seen examples from this set surface prior to the last few months, I surmise these were made for a single season only. Given the graphics, the pop-up and the cool closing method (The "To Let" sign is perforated.) these were expensive in 1925.
Mark B. Ledenbach's vintage Halloween collectibles blog.