The Diddly Bo or Cigar Box Guitar has its origins from West Africa. Where children would play it as a percussion instrument with a slide. Sometime only have one string. Using the slide to move up and down the neck to change the pitch. Coming to America with the slaves it was seen as a easy to make musical instrument. Once going into commercial production and marketed at a toy in the turn of the century.
The Neck corners have brass protectors
You can see here a old fashion metal shoehorn was used folded over the box and they screw is left for the strap