Mercury Model 500 Component Substitutor Pre-1930 Original. Maker : Mercury Electronics Corp. Time Period Manufactured : Pre-1930. This refurbished item has been previously used and may exhibit some signs of cosmetic wear, such as minor scratches or scuffs. However, it has undergone rigorous testing to ensure it is fully operational and functions as intended. This item may have been a floor model or a store return. Refurbished and Tested: Each unit has been carefully inspected, cleaned, and restored to full working condition. Operational Guarantee: The item is fully operational and functions as intended. Cosmetic Wear: May include minor cosmetic imperfections such as light scratches or scuffs, which do not affect the item’s performance. This item comes with a. Against any hardware defects.