The big dial on the panel is the only knob. Those 3 little points are for the panel light, interior light, and the rotisserie/raise and lower the broiler.
They are just pushbuttons. Our 1961 O'Keefe & Merrit had basically the same panel, but clock was located differently and ours also had a thermometer for roasts. But the 3 pushin little buttons were what I described.