The correct name for the Czech cylindrical 9 mm cartridge is (without the various punctuation marks on the letters. I cannot reproduce all of them here so I have chosen not to reproduce any of them): 9 mm ostrych naboju - valcovych. One box label indicates a production date, at Vlasim, of November 1947. There seem to be many different forms, depending on usage, of the word “valcovych” and other forms may also be proper for this name depending on context, but this one is taken direct from the box label.
There was an unheadstamped, steel-case, Czech 9 mm Parabellum round as well, but it should not be easily confused, as it has a typical Czech chromed bullet. Just for the record though, the case mouth diameter of one specimen, in my collection, of the experimental cylindrical cartridge is 9.77 mm (0.386") with an almost identical case head diameter.
The reddish finish to the case is another hallmark of this cartridge, although a very small quantity were made in what appears to be lacquered steel cases, as well as a brass-case version. The latter two are very scarce.
There was a previous thread on this cartridge begun March 13, 2010, entitled simply “id 9 x 19.” Please not that for searching purposeds, the “id” is as I have typed it here, in lower-case letters without punctuation. There was also an article on the gun and ammunition in the Czech magazine “S’trelecky Magazin,” issue of August 1999. It is in the Czech language.