This is a very rare Tenyo item from 1972. Googling it, the only listing that I found was an auction listing from 2014 where the item sold for upwards of $700. It is in good condition. The packaging shows some wear. The biggest flaw is that the envelope shows some yellowing (see image). Checked to be complete.
A silk Handkerchief is shown to the audience, laid on the table in front of the magician and folder into a square. The performer now shows a small white envelope and holding it up to the light, says that it contains an invisible man and asks if anyone can see him. They answer “No” as it contains nothing. The performer states that he will open the envelope and show everyone the invisible man. In doing this a number of footstep are seen, on the inside of the envelope. The magician say that the invisible man ran out and went into the handkerchief. Placing his fingers near to the edge of the handkerchief, the handkerchief suddenly begins to rise and fall in a ghost like fashion. After this happened several times the magician takes the invisible man from the handkerchief and place him back into the envelope. The envelope is held up the light one more time and the invisible man is now seen to be visible inside the envelope.