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This is a genuine Ronda 1042 coil block, a Swiss-made component for the Ronda 1042 4¼”’ ultra-small quartz movement. It serves as the core electromagnetic component of the stepper motor, converting electrical pulses from the circuit board into magnetic force to drive the gear train for precise timekeeping. This product is brand new and original, intended for servicing and repair of 1042 movements.
Brand：Ronda (Swiss)
Compatible Movement：1042 Slimtech series (4¼”’, approx. 10.40mm)
Origin：Swiss Made (5 jewels, gilt) / Swiss Parts (5 jewels, nickel)
Quality：Genuine original, brand new
Function：Converts electrical pulses to magnetic force for stepper motor
1. Is this coil block an original Ronda genuine part?
Yes. It is an original Ronda factory part from Switzerland, designed for the 1042 Slimtech ultra-small movement.
2. Which movements is this coil block compatible with?
It fits the Ronda 1042 two-hand quartz movement (4¼”’, 10.40mm diameter, 2.90mm height). The 1042 is a two-hand, no-date movement with one crown position for time setting. It is the smallest Slimtech caliber, designed for ultra-small ladies’ watches and jewelry watches.
3. What are the symptoms of coil block failure?
The coil block is the core drive component of the movement. Common symptoms include: movement not running after battery replacement, noticeable time gain/loss, or intermittent stoppage. The 1042 offers accuracy of -10/+20 seconds/month and can use either standard 335 or high-capacity 317 batteries. Timely replacement is recommended.
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