Interesting bottle vase with acid etched finish decoration

Hi

I have three of these now but have never found out anything on them. The bottle vase is clear glass with clear base and then decorated with the shown rather charming irregular pattern. This has not so much been painted on but almost acid etched into the glass leaving it with a distinct roughness to the exterior of the glass. A perfect pattern with no clear start or end so not as if it was a transfer wrapped around.