$5.00
You Saved
This is a genuine ETA date jumper with part number 2000-2576, Article 38, Made in Switzerland, designed for the Longines Caliber 595.2 movement. The date jumper is a critical component of the calendar mechanism, responsible for advancing the date ring precisely at midnight and holding it securely in position under spring tension.
As an original factory part, it is the ideal choice for replacing aged, broken, or weakened jumpers during service or repair.
| Feature | Description |
|---|---|
| Compatible Movement | Longines Caliber 595.2 (based on ETA 2000 series) |
| Part Number | 2000-2576 |
| Article Number | 38 |
| Part Name | Date Jumper |
| Material | Hardened steel – wear-resistant and durable |
| Core Function | Advances the date ring for date change; holds the date ring in position under spring tension |
| Origin | Made in Switzerland |
| Product Type | Genuine ETA part |
Longines Caliber 595.2 Technical Background:
| Parameter | Value |
|---|---|
| Movement Type | Quartz |
| Functions | Hours, minutes, seconds, date |
| Battery | 371 / SR920SW |
| Jewels | 5 / 7 (depending on version) |
| Origin | Switzerland |
| Instruction | Details |
|---|---|
| Primary Use | Core component of the calendar mechanism – advances and positions the date ring |
| Normal Function | At midnight, stored spring tension is released to instantly advance the date ring |
| Failure Symptoms | Aged or broken jumper causes: date does not change, date sticks between numbers, sluggish date change |
1. Remove Old Part:Open case, remove movement, remove calendar module bridge to expose date jumper
2. Remove Old Jumper:Carefully remove old date jumper – check for breakage or deformation
3. Cleaning:Clean the jumper mounting area and date ring teeth – remove old oil and debris
4. Inspect Date Ring:Check date ring teeth for wear or damage
5. Install New Jumper:Align the jumper‘s pivot with the main plate hole – gently press into place with tweezers
6. Install Bridge:Reinstall the calendar module bridge and tighten fixing screws
7. Testing:Manually turn the hands – verify crisp, immediate date change around midnight
Important Notes:
Danger Zone Warning: The calendar mechanism is engaged between 9 PM and 3 AM. Quick date adjustment during this period may force the jumper, causing deformation or breakage.
Perform installation outside this time period or with the calendar mechanism in a neutral position.
| Aspect | Guidance |
|---|---|
| Inspection Period | Inspect date jumper for deformation or weakened spring tension during each movement service |
| Wear Indicators | Signs of wear include: sluggish date change, inaccurate date positioning, date sticking |
| Breakage Treatment | A broken jumper must be replaced immediately – repair is not possible |
| Cleaning Method | Clean mounting area with specialized solution; do not bend or overstretch the jumper |
| Replacement Interval | Replace immediately when aged, deformed, or broken |
| Service Advice | For quartz movements, inspect calendar components during battery replacement every 3-5 years |
Q1: Is this date jumper compatible with my Longines Caliber 595.2?
A: Yes, this jumper (part 2000-2576, Article 38) is specifically designed for the Longines Caliber 595.2 movement. Please verify your movement model before purchase.
Q2: What is the “danger zone” for calendar adjustment?
A: The danger zone is typically between 9 PM and 3 AM. During this period, the calendar mechanism is engaged. Quick date adjustment during this time can force the jumper, causing deformation or breakage.
Q3: What are the symptoms of a broken date jumper?
A: Symptoms include: the date does not change at midnight, the date sticks between two numbers, or the date does not advance when the crown is turned.
Q4: Can I install this jumper myself?
A: This replacement requires movement disassembly and careful handling of small parts. If you lack experience, professional installation by a watchmaker is strongly recommended.
Q5: What other parts should I check when replacing the date jumper?
A: Calendar system wear is often synchronized. When replacing the jumper, inspect and replace the date driving wheel and date ring at the same time if worn.
Q6: Is this a genuine ETA part?
A: Yes, this is a genuine ETA factory part, made in Switzerland, and brand new. It is not an aftermarket or generic replacement.
Fast worldwide shipping within 3 business days.
Competitive pricing on Seiko/Hattori calibers.
3,000+ watch movements and parts in stock.
Trusted by watchmakers worldwide.
Personalized sourcing support via [email protected] or WhatsApp +86 18620212114.
