Tango Bowls Loetz?

I just saw the post by Tinhouse of the picture from the Passau Museum of the beautiful Tango pieces with regard to the bowl on the bottom right. I might be able to help with the mark since mine appear to be the same. I have it in two sizes, the smaller being a little more red than the larger one. The mark has the straight line "Czechoslovakia" and a ground pontil. I know this isn't the same as seeing the bottom in person, but might be helpful. The mark is hard to see but is right above the pontil.