Kalmar. Nice glass brass flush mounts by Kalmar/Austria comprised of thick individual two-colored glass pieces and brass hardware.
One large e27 bulb. We have many other pieces available from Kalmar (sconces, flush mount lights, chandeliers).
Kalmar had a cooperation with several Italian glass makers located in Murano (amongst which Mazzega, Venini).
Several other European companies like Orrefors (Sweden), Limburg and Hillebrand from Germany, and Arredoluce, Silnovo, Fontana Arte from Italy used handblown or textured glass for their lamps in the 1950s, 1960s and 1970s.