旧式

1. Origins, structure, and basic meaning

• Structure: 旧式 is read as きゅうしき and is a noun-like expression for machinery or products whose design belongs to an older type.
• Basic usage: Use 旧式の機械 before a noun and 電話は旧式です predicatively.

2. Common pitfalls and similar expressions

• Old type does not mean unusable
  • Being old-fashioned does not itself mean broken or unusable; the machinery remains in service and the phone may be liked for simplicity.
• Design rather than mere age
  • 古い can describe age broadly, while 旧式 focuses on a design or system belonging to an earlier generation.