Specifications:

• Lépine pocket watch calibre 9520 with manual winding mechanism
  • IWC inhouse production
    • based older calibre 95 (whick lacked shock protection)
  • diameter: 37.80 mm
  • height of movement: 3.35 mm
  • number of jewels: 19
  • frequency: 18,000 A/h = 2.75 Hz
  • balance spring: Breguet
  • fine adjustment: classic regulator
  • shock protection: Incabloc
  • surface: gilt
• amagnetic to 40,000 A/m, movement protected by Farraday's cage made of soft iron inner case and soft iron dial bottom
• movement cushioned within case by shock absorbing rubber blocks
• small second at 6 o'clock
• tripartite screwed case, water resistant to 3 atm
  • top part with bezel: flat surface with 5 recesses (for screwing tools) in stochastical position
  • bottom with three concentric circles, outer ring with 5 recesses reflecting bezel theme
  • glass: sappire
• on dial above centre Ingénieur in italic script and french notation (with acute)
• small case number on the edge of the outer ring

Models (in bracket sales figures between February 1991 and July 1996 as published by Michael Friedberg on IWC-Forum, 10/2/2005):

• 5215-001: rhodium plated (93 pieces, 69%)
• 5215-002: black (20 pieces, 15%)
• 5215-003: white with indices (12 pieces, 9%)
• 5215-004: white with roman figures (10 pieces, 7%)

Note: figures do not represent total production numbers because accounts for earlier period (1982-1991) are not yet published.