Need information on elegant glass with "Z" foil label (or perhaps it is 2 upside F's)

[muskiehuntress]

Recently purchased 7 colored apertif glasses.  One bears a "Z" foil label.  Anyone know who the glassmaker is? I tried googling it and also replacements .com to no avail. 

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[kaudet4gx3]

Hi there,

Think these are Zylstra Crystal 

Kathy

[randy14darlene]

Definately a German form of the letter Z. You may try to research Zweisen glass.