Buyers should prioritize the movement type, which is the heart of the clock. Mechanical movements (typically 8-day or 31-day) appeal to the luxury and collector markets, while quartz pendulum movements are preferred for mass-market retail due to their low maintenance and cost-effectiveness. Ensure the housing material is specified, such as solid wood (oak, walnut, or cherry) for premium lines, or MDF with wood veneer for budget-friendly options. Additionally, verify the pendulum swing amplitude and timekeeping accuracy (typically +/- 1 second per day for quartz).