Cell type: Selenium
Measure type: reflecting/averaging
Walz began as the export arm of Okada Optical in Japan, but eventually became simply Walz (at least in the US). They made a few cameras, but I mostly know them for their accessories: namely filters and the odd light meter or two. It was Walz, for instance, which ended up with the Norwood Super Director.
I believe this was actually made by Sekonic, as it's a dead-ringer for their LC-2 with only a couple of changes. And if the magazine ads are right, it appears to have lived as a Kalimar, the Konicameter, and possibly a version of the Leicameter as well.
Nice little meter. It has an accessory foot so you can put it on the shoe on a meterless camera.