Alistair,
my grandma had a toaster like the one in your photo up at the top. I think it was called a sandwich griller. The brand was either Mirro, West Bend, or Presto.
I can't remember, but it was not Sunbeam, or Toastmaster.
It is from the early 60's. She had it a long time, on a counter top between her 1950's 36 inch Magic Chef stove, and early 60's Hotpoint 17 cubic foot refrigerator.