Hello, I believe the label, if I am seeing it right, is the remnant of a label which would have read "Royal Artglass". It appears the last two letters on the top line are AL with the upper right portion of a Y there also....
Maybe you can confirm that.
If that is the case, the label, as far as my research has indicated, was used post WWI. Although I can not confirm it yet, my strong belief is that it is a label that may have been used by Franz Welz. I have seen it on a hand full of pieces I believe to be Welz decors. I believe it may have been used on pieces exported to the North American market....
With or without a confirmation as to the house that produced it, it indicates that what you have is a piece of Czech glass ca. 1920 or so. Nice find....
I am attaching two label images, and also a similar decor on a different piece.... The last image is the version of the Royal Artglass label, most probably the one your piece has, as I believe it to be embossed and not just printed.
Craig