I don't believe it's original, because a factory covering would still allow for the camera maker (either Zeiss Ikon or Contessa Nettel) to have its logo visible in some manner.
Plus, I know that it was the roaring 1920s, but I don't think that snakeskin was fashionable for photographic equipment of that era.
Seriously though, I don't think it's OEM, although it appears to be very nicely done.
The Piccolette is easy to cover, because most of the cameras had no covering -- just black paint.
Also, this has a very inexpensive lens and shutter combo, which goes against the bling. Of course, bling and high end were never kissing cousins, as we continue to learn from popular culture.