When purchasing a high-value Odachi sword, consider craftsmanship, blade material, and authenticity. Look for high-carbon or folded steel for durability and sharpness. Ensure the blade’s length and balance match traditional proportions. Examine the polish, hamon pattern, and fittings for quality and artistry. Authentic certification and reputable sellers are essential. A true Odachi sword should embody both aesthetic beauty and superior performance, making it a prized collector’s piece.