Omega Calibre 1861A Technical Guide
Technical guide for the Omega Calibre 1861A—a precision 12-ligne chronograph movement with 18 jewels, 27mm diameter, and 48-hour power reserve. This document provides technical specifications including movement height (6.87mm), frequency (3 Hz / 21,600 A/h), angle of lift (50°), and winding stem diameter (Ø 1.00 mm). Contains general information sections covering disassembly, cleaning, checking, assembly procedures, and tool requirements. Reference document for horologists and service centers working with this classic chronograph caliber.
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Document Details
- Format
- Pages
- 17
- Size
- 2.5 MB
- Category
- Watchmaking