Those are wonderful, aren't they? My guess: Hand drawn, with frequent use of a French Curve. https://www.google.com/search?q=french+curve https://www.google.c

Those are wonderful, aren't they? My guess: Hand drawn, with frequent use of a French Curve. https://www.google.com/search?q=french+curve https://www.google.com/search?q=french+curve