The Instant Bulk Audio Tape Eraser Retro by Osmabet is a convenient tool designed specifically for erasing audio tapes quickly and efficiently. This tape eraser allows  easy removal of unwanted recordings. Includes instructions dated 1959 and it cost 27/6d, ( aprox £1.37p ) a fair bit of money in 1959. It's in fairly good condition for age, there's a stain on the box