Whilst searching for a watch a while ago using the term 'Vintage Seiko' - I stumbled across the Seiko Executive Talking Egg. Unable to determine any more information about the product I picked it up to see exactly what it did and how it worked. You can find out in the video below.
In the video I mentioned that this product doesn't have the usual Seiko quality that I'd expect. It seems it was branded by Seiko US but manufactured by another company. The base has the word Sekisui printed on it, which likely refers to the Japanese company Sekisui Plastics, a manufacturer that has been around since 1959 and could have produced the outer casing.
A number of people have suggested it might not be an official Seiko device, but there's no evidence to back up this supposition whereas the box and instructions (copy below) refer to Seiko. It's all academic, it's a rare 35+ year old device you can't buy any more and whether it was made by Seiko or Techmoan Electronics Corp doesn't make a jot of difference to the fact that it is still an unusual product that was very much of its time.