A common mistake is to mix up Orno and Idman glass pendant lamps.
The ORNO lamp, made by Lisa Johansson-Pape (LJP) in 1948 with a glass from Iittala.
The glass is clear and painted with gold lines.
You find also wall and ceiling lamps with gold painted lines.
The Idman version is not attributed to any designer (at least not Paavo Tynell, nor Mauri Almari)
The glass is stripped with rattan (rotin/rottinki) but is not painted.