Seiko Sportsmatic 5 Brand: Seiko Model: Sportsmatic 5 Movement: Mechanical (Automatic) with 21 jewels Key Features: It includes a day-date display at the 3 o'clock position (shown in Kanji and English) and a recessed crown at the 4 o'clock position. It also incorporates Seiko's "Diashock" (shock protection) and "Diaflex" (unbreakable mainspring) mechanisms for durability. Era: These models were manufactured primarily in the 1960s, with many examples from 1965-1966. Water Resistance: The "Water Proof" text was used on these early models, typically meaning they offered sufficient resistance for everyday use (e.g., 30m) rather than professional diving standards. The original "Seiko 5" line was groundbreaking as the first self-winding watch manufactured in Japan, known for its practical functions and robust design