Hanging undulating opaline blinds

Nice opaline hanging that was found in kitchens in the 50s or even 30s. It is in very good condition, no problem on the opaline, not even around the page that is brass, just like the rest of the electrical system. Its dimensions are 15 to 50 cm for the height of hook that is adjustable and 25 cm for the opaline which is 5 cm high.