Awesome Mixer and Cake!
Paul, great looking mixer and I bet that Cocoa Angel food cake was great tasting as well. That is a fat free dessert I make on occasion as well. My favorite cake for testing an oven is old fashioned yellow butter layer cake. I also use Rumford baking powder because others have an after taste I don't like.
I moved about 6 months ago from an apartment to a house and adjusting to having a gas oven now after using electric stoves for over 25 years. To bake cakes staying accurate to the recipe times I had to lower the thermostat 30 degrees(F).
My mother still is cooking using a 48" Tappan gas stove bought in 1949! The only repair it has ever needed was the oven thermostat about 30 years ago. She also is still using a Hotpoint refrigerator that was bought back in 1952! To keep it frost free, she has timer connected to it and water collects in the chiller tray that she empties about once a week. My mom still has the Hamilton Beach food mixer, a white model H, that Dad gave her the same year I was born! Her 1952 Toastmaster toaster bit the dust about 8 yrs ago! Some how she has managed to have appliances that have served her well. She taught my sister and I how to cook and care for the appliances to keep them new looking. Once a month we spent Saturdays using Jubilee polish and Glaswax in the kitchen and bathroom. Sis and I carried over the same habits to our own households today.