Perhaps I missed this thread first time around? But ... In a thread from 2007, I added some comments
about three "opal iridescent" items I have (a pair and a single). The image I gave is now included here as well:http://glassgallery.yobunny.org.uk/displayimage.php?pid=7183&fullsize=1
My vases seem to be much the same style and decorative effect as the one with which "m" started this thread. As I said in the other thread, my thinner, taller (16.5 cm) vases appear to be identical to the one illustrated in Manley, pages 54/5 (item 16) - as discussed earlier in this message.
My smaller (12 cm high) but wider (14 cm at the rim) vase is very much like one shown in another thread
(started by "mattglass", in 2010). In that other thread, Keith added comments and a pic of some of his Kralik pieces, which includes one probably the same in shape and size - although Keith's is a textured example.
Also, in the more recent site (by GMB member, Craig + others), Bohemian Glass
, there is a page showing several "Mother of Pearl" items. In that page, the 4th vase in the 1st row looks to be the same as my 'smaller wider' one - and it is untextured, too. To find the page, navigate into the site then click on "Alphabetical Decor Index" under "Kralik" and select "Mother of Pearl".
I think that these various plain and textured "mother of pearl" items queried in the GMB and shown in Craig's site are all by the same company. And if Craig & co are correct, then they are all Kralik, which is the first "proof" I have seen that Manley was, indeed, incorrect about pieces like these.