The listing is for an antique Illinois Railroad pocket watch from the early 1900s with a handsome yellow gold filled keystone case. It features a classic mechanical (manual) movement with 21 jewels, making it a reliable and high-quality timepiece for men. The Illinois brand and specific serial rnumber 4009300 indicate its historical significance and craftsmanship, making it a valuable piece for collector trends enthusiasts of vintage timepieces. Case shows no wear to the gold fill. Dial has some hairlines. Movement is amazing and keeping great time.