Train Mechanical Pocket Watch -on Fob or Necklace48mm antiqued brass mechanical pocket watch. On 30 inches of antiqued brass chain or on a mens fob that hooks onto your belt. Just let me know which you'd like at checkout. Both the inside and back of the watch see through to the gear movement. The movement is mechanical and so will need wound every day in order to keep accurate time. The picture on the model isn't the exact same watch but is the correct necklace chain and watch size for reference.