this centre piece does look to be a match for pattern/item No. 1938 - page 22 - from the 'Rosice Glassexport 1958' catalogue, where the height is quoted as 16 cms., which is the metric equivalent of c. 6.5 inches - think I'm correct in saying we're not now allowed to link to this catalogue?
In view of the o.ps. quoted date of 1938, I'm wondering if there is some confusion here, and the catalogue No. has been taken as the date?