Sixtomat light exposure meter - vintage

Sixtomat handheld light exposure f/stop meter. Vintage. Has an analog meter. Made in Germany. Got this out of my grandfather's house. Cosmetically, it is in nice condition. The meter shows moderate signs of prior use. Some small scuff marks and scratches. Comes without original casing and strap. Works without batteries. Metal ‘curtain’ to close the meter slides with some difficulty. 3" long. Measures accurately, I think but not 100%, I know nothing about camera stuff. I do see the bar more slightly.