The eBay item you highlighted was very definitely a production item. Apart from the last three hours or so, (power-cut) I have been trading e-mails regarding these. Talking to one or two specialists, including the seller of this item, and working from the available material, (CGR) the matte version of this figure, may have been available, without matte frog and bowl. Having seen several different complete set images this morning, all were clear, not matte finishes.
There is a possibility that the matte item on a pentagonal base is by the same designer, (ie it may not be 1930s, Forejtova would have been in her teens). That may indicate a re-modelling of the figure, to the much less angular form in this set. If that is so, that may also indicate why this figure came to be viewed as a stand-alone. Unfortunately Forejtova died several years ago, so I am not able to ask, and much of the paper-work was destroyed after 1991.