The control knob looks like the one off a Dualit toaster (their Classic model is also extremely repairable), as do the heating elements: https://www.dualit.com/collections/toasters

(I bought a Dualit after using one at a B&B many years ago -- I absolutely love it, though it really is a little overkill for making a few slices of toast each day. But it's a pleasure to use.)