What are the defining characteristics of the 'old' Marvel comic art style (Golden/Silver Age)?

The 'old' Marvel art style, prevalent during the Golden Age (1930s-1950s) and Silver Age (1950s-1970s), is characterized by simpler anatomy, exaggerated features, and dynamic posing. Artists often used bold outlines, limited shading (often flat colors), and a focus on storytelling through dramatic compositions. Facial expressions were frequently exaggerated for comedic or dramatic effect. Lettering was often hand-lettered and integrated into the artwork.