Watch Movements FAQ
Cas-Ker watch movements are organized by brand name and caliber, and searchable by any associated movement information - ligne, diameter, even by which battery cell it uses! We stock hundreds of movements, ready for immediate delivery. We also carry a complete line of movement accessories and every tool a watchmaker needs to replace, repair, and install watch movements and movement parts.
What is a ligne?
The ligne is a historic unit of length originally used in France until the 18th century, and retained by watchmakers to this day. One ligne is approximately 2.256mm or 0.0888 inches. Pronounced "line."
How is a movement's overall height measured?
The overall height of a watch movement is measured from the bottom of the movement to the top of the center post or cannon pinion.
Stem Tap to Millimeter Conversion
- Tap 2 = 1.5mm
- Tap 4 = 1.3mm
- Tap 6 = 1.2mm
- Tap 7 = 1.2mm
- Tap 8 = 1.1mm
- Tap 9 = 1.0mm
- Tap 10 = 0.9mm
- Tap 11 = 0.8mm
- Tap 12 = 0.7mm
- Tap 13 = 0.6mm
- Tap 14 = 0.5mm
Convert Miyota letters to Citizen numbers
example: 5Y30 = 5930)
- Miyota L = Citizen 0
- Miyota M = Citizen 1
- Miyota N = Citizen 2
- Miyota P = Citizen 3
- Miyota R = Citizen 4
- Miyota S = Citizen 5
- Miyota T = Citizen 6
- Miyota U = Citizen 7
- Miyota W = Citizen 8
- Miyota Y = Citizen 9
Are Cas-Ker's movements under warranty?
Our movements are warranted to be running accurately (within factory specs) when you receive them. Return immediately if any do not meet your satisfaction. Any further warranty is between you and your customer. Movements with dial dot or cleaning fluid residue, lint or fingerprints will not be exchanged.
