Antique red wine glasses in guilloche crystal, late 19th early 20th century (set of 6)

6 red wine glasses in guilloché crystal. Possibly late 19th early 20th century, prolific period of the guilloché technique. But what is guilloché. A technique of hollow engraving by removing material and decorations of lines, curved and wavy lines that intertwine or often cross. Good condition, nevertheless some small manufacturing defects on the decoration in places or bubbles. Water glasses, white wine glasses and champagne coupes of the same model are also available. 📐 diameter 6.4 cm X height 12.5 cm weight of 6 glasses: 600 gr.