This bowl is from the Barolac range, originally produced by Inwald at Rudolfova Hut in the former Czechoslovakia. Most of the designs date from the mid thirties but have been in production for many years. I can't recall the catalogue no. for this particular pattern, but it's likely included on the CD that comes with Marcus Newhall's book. Interestingly there appear to have been a few variants of this pattern made, some with the fitting for a frog some without, while other versions have a smooth rim.