Case XX "Hammerhead"(Large Sportsman Lockback) Special Limited Edition  IAMAW ~ Vintage 1990

• Pattern & Model Name: Case XX 2159 LSSP, universally known to collectors as the "Hammerhead"pattern (or Large Sportsman Lockback). 
• Decoding the Pattern "2159 LSSP":
  • 2 = Black synthetic/composition handle material (Delrin).
  • 1 = Single blade configuration.
  • 59 = Case's factory designation for the Hammerhead frame size/shape.
  • L = Lockback mechanism.
  • SSP = Stainless Steel blade and springs, Polished edge. 

• Closed Length: 5 inches (12.7 cm)
• Blade Length: Approximately 3.5 inches (8.9 cm) clip-point blade featuring a prominent nail nick.
• Weight: Heavy and robust, weighing roughly 9.5 ounces.
• Build Materials: Mirror-polished True-Sharp stainless steel blade, solid brass liners, thick brass frames, and polished brass bolsters.
• Commemorative Details & Provenance

• The Year (1990): Datable via Case’s unique tang stamp system (typically featuring a specific combination of lightning bolt "SS" lettering and dots indicating 1990).
• The Union Etching: The blade or handle prominently displays an inscription honoring the International Association of Machinists and Aerospace Workers (IAMAW) Local Lodge 851 based out of Joliet, Illinois. Historically, IAM Lodge 851 served as the exclusive bargaining representative for thousands of industrial workers at the massive Caterpillar Tractor Company manufacturing plant in Joliet. 
• The Personalization: The name Joseph M. Votta indicates that this piece was either a personalized presentation gift for an individual’s retirement, milestone service anniversary, or custom-engraved for a dedicated union officer/member within Lodge 851.