Nice little switch. I found one similar to this (with two fuses) on eBay a couple of years ago, and bought it to add to my collection.
Mike (mamills)
I have a beige one like this. It's used in conjunction with a 15A fuse as a safety switch for a homemade 8 channel light controller.
What vintage is this? 1950s/60s?
1940s/1950s I guess. We have more modern two pole ones around here, made by Amalgamated Electric in the 1960s or 1970s.