Knobs for 1920s–1960s stoves — O'Keefe & Merritt, Wedgewood, Chambers, Tappan, Gaffers & Sattler. Originals are rare-find restoration parts at $30–$139 each; printing a matched replacement keeps the stove cooking while you hunt originals (or instead of it).
Match the bore to your shaft, pick a style and color, and get it printed and shipped for
about $20 — or download the STL free and print it yourself.