When buying antique furniture, there are several important factors to consider. Firstly, check for authenticity by examining the piece's construction and materials. Look for dovetail joints, a sign of high-quality craftsmanship. Inspect the hardware, such as drawer pulls and hinges, to ensure they are original or appropriate for the period. Assess the overall condition, including any signs of damage or repairs. Additionally, consider the style and size of the piece to ensure it fits your space and aesthetic preferences. Finally, evaluate the value by researching similar large items and comparing prices.