This is the plastic box similar to what Adam's puts out now, but the block inside is solid wood with inlaid metal color spots -- not the cardboard block they supply these days, or even the plastic block with colored spot stickers that they first subbed in. I think they switched to plastic blocks with paper stickers for color spots in the 1970's. Even before they went to plastic, they lessened the quality control on the wood blocks -- in the 1970's they were not so smoothly finished around the inlaid spots. So this one is certainly early 1970's or 1960's.
This is very collectible, and still a great trick for laymen! The block is placed in the box, after the spectator has noted which color is uppermost (this fact hidden from the magician who has turned away). The closed box is handed to the magi behind his back, who turns back to the audience, and immediately brings the (still closed) box out front, holding it to his forehead. Afer a moment of intense clairvoyant concentration, he names the uppermost color.
These vintage wooden block Color visions show up on eBay from time to time at about $25-30. This one has a condition problem -- some scratches/abrasions on the black spot, which you can see in the close-up photo. The issue could probably be restored by a carefully applied Avery round label in black(?). The problem does not effect the performability of the prop.
But since it has this issue, I am discounting it by about 33% A great deal if you don't mind a bit of wear on your prop, or can cover the black spot with a sticker or replacement metal disc.
Instruction sheet is a photocopy