This is a rare Rene Lalique glass.
Champagne glass, pattern " CACTUS ", created in 1934 by RENE LALIQUE, claret wine n° 4.
Clear round base and bowl and thick stem with black enamel highlighted cactus skin .
It is signed " R.LALIQUE ". Sometimes the signature is a bit difficult to read.
You will find this glass in the Mr Félix Marcilhac catalogue, page 849.
Dimensions: Hight: 8,2 cm Diameter: 10,4 cm
Epoque: 1934 - 1947 (not made after 1947).
PERFECT CONDITION, a few tiny air bubbles in the glass as often on old Lalique glass.
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Here is a converter inches / cm to help you with the dimensions: