How Much is a 1937 Harley-Davidson Big Twin Flathead Worth at Auction?

The Harley-Davidson Big Twin Flathead (production years 1929–1948) is a vintage side-valve V-twin renowned for its thumping low‑end torque and rugged mechanical simplicity. Its exposed flathead cylinders, teardrop fuel tank and period Art Deco lines embody the styling that appeals to classic car and motorcycle collectors alike. Cherished for straightforward maintenance, a distinctive exhaust note and strong presence at vintage rallies, the Big Twin Flathead remains a compelling collectible for fans of American two‑wheel heritage.