Angela,
I am thinking there may not have been as large a production run on them compared to the regular Flora bowls.
They are double the weight. The Flora is about 1.07 kg. and this larger bowl being 30 cm. Ø is approx. 2.14 kg. The raw materials used to make them would them at least twice the price, and far more costly. As some of these bigger bowls were made with lugs near the internal centre of the ibase, presumably, to stop the figurine moving around, and some were made without the lugs, perhaps those without the lugs might have been made to include the vase in the middle of the bowl, as shown in Nigel's photo. The vase certainly has the same, crescent shaped loops, at the foot, as the large bowl has in its base.
Walther had a couple of designs where this was done. One was the "Rudolph" bowl with a "Rudolph" vase inside (p.158 1935 cat.), and another was the cupped "Orla" bowl,with a vase having an attached frog, which Walther named, as a set, "Greta" (p.75 1934 cat.) The "Greta" Walther (aka VEB Sachsenglas) vases we see sold so much, do not seem to appear, in the most common catalogues available, until after WW2, when the glass was being made in the DDR, and exported to the west to raise foreign currency. This could be another example of a name from a 1930's design being reused on a more modern design.
Neil