Large Modern Clear Glass Vase - Freeform -Maker?

Hello - I purchased this LARGE (11" tall) clear glass vase from a Washington, DC area estate that included largely fine quality contemporary decorative items, especially glass. The form brought to mind certain modern pieces from Scandinavia, especially Finland (Iittala) though it is much heavier. What appealed to me was the simple, freeform design and particularly the varied thickness. I could find no markings so wondered if any viewers might be able to speculate on the origin. Thanks