I fixed another one of these yesterday. Mine, for some reason, differs in that it had a trim pot in stead of the fixed resistor hooked up to the CdS cell. The trim pot had rotted out from battery acid, but I replaced it with one of the tiny little pots you find on the main PCB of an Olympus OM-10 (of which I tore a seized-up example down once). Strangely, it now happily meters the same as the little Sekonic L216 I use and know to be 'good'
So, I promoted it from my junk equipment collection to my Yashica-A kitbag.