Quetscher, I read on the site below that the case came in black plastic and natural wood so I assumed that there was two separate models available.
This information was translated from this site so it may not be accurate
If it is a celluloid (plastic wrap, plastic laminate or tolex material) and wood, I probably wold not be interested in that model and would only be interested in the all wood version. If there is a plastic cases version I would consider it only because of the moisture and if the sound was as good as the all wood version. I wish they would post a picture of the available models and finishes.
Thanks for the insight