ST36 Movement : The Reference Learning Caliber

The ST36 (ST3600) is a hand-wound mechanical movement widely used as a reference caliber in beginner watchmaking courses.

Its large size (~36.6 mm) makes it easier to work on than a typical wristwatch movement: parts are more readable, hand movements are less cramped, and disassembly/reassembly is clearer.

The layout follows the ETA / Unitas 6497 architecture.
There is extensive documentation, diagrams, and tutorials online.

Ideal for learning to disassemble, clean, oil, and reassemble a mechanical movement.

Specifications

• Caliber: Sea-Gull ST36 / ST3600 (TY3600)
• Type: mechanical, manual wind
• Diameter: ~36.60 mm
• Height: ~4.5 mm
• Frequency: 21,600 vph
• Jewels: 17
• Functions: hours, minutes, small seconds at 9
• Architecture: ETA / Unitas 6497 type
  
• French stock

Ships as a bare movement (no case or dial). Chronofix stock photos.