Based on style, materials and design, BRIO is the most likely manufacturer, or a Nordic producer with a similar aesthetic. The stripped-down but sophisticated look of the lamp is in line with the Scandinavian modernism that characterized BRIO's dollhouse products of the period. BRIO often used a jacaranda-like plastic pattern in their furniture during this time, which is consistent with the lamp's base.
However, there is no documented catalog image, which means that it cannot be completely ruled out that this is a niche manufacturer inspired by BRIO's design language.