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Felsa 4028
Ligne: 13.5'''
Jewels: 1/17/21
Lift Angle: 45°
Power Reserve: 36 hrs
Frequency: 18000 vph
Type: Manual Wind
Period used: ~1975
Diameter: 31.05 mm
Height: 4.6 mm
Hands: 1.80 x 1.30 x 0.35 / 0.18 mm
The Felsa 4028 watch movement features a pin-lever escapement and an indirectly driven minute hand, allowing for a large balance and low profile. It has the option for shock protection through elastical spiral balance spokes and is often or always identified by its 8810 signature. The movement offers various functions, including a manual wind stop minute, a continuously running center minute that can be reset with a pusher at 2 o'clock, a sub-second display, and a date function that can be set within a +/-24-hour range. The Felsa 4028 movement was predominantly used during the period around 1975.
The Felsa 4028 features the following functions:
- Calendar
- Continuously running center minute, reset with pusher at 2h
- Date: set by +/-24h
- Manual wind stop minute
- Pin lever
- Sub Second
Mainspring Listing
| Dimensions | GR Reference # | End Type | Buy |
|---|---|---|---|
| 1.35 x 0.130 x 360 x 11.5 mm | Manual | Buy mainspring | |
| 1.35 x 0.135 x 340 x 11.0 mm | GR3518 | Manual | Buy mainspring |
Incabloc Part Listing
| Block # (Top/Bottom) | Cap Jewel # (Top/Bottom) | Spring # (Top/Bottom) |
|---|
KIF Part Listing
| Block # (Top/Bottom) | Cap Jewel # (Top/Bottom) | Spring # (Top/Bottom) |
|---|
Documents
Parts Listing
| Part Description | Reference # | Alternate | Buy |
|---|---|---|---|
| BALANCE COMPLETE | 721/1284 | 721/1284 | Buy part |
| ESCAPE WHEEL, C/S | 704/305 | 790/2/BET 8800 | Buy part |
| ESCAPE WHEEL, S/S | 705/998 | 790/BET 8800 | Buy part |
| MAINSPRING, WHITE-A-LOY | 458/R | Buy part | |
| PALLET (FINGER) | 710/967 | 800/BET 8800 | Buy part |
| PALLET ARBOR | 72S/330P | 714/BET 8800 | Buy part |
| ROLLER, FINGER | 82S/337R | Buy part | |
| STAFF, REG/SHOCK | 100/2237 | Buy part | |
| STAFF, W/FINGER | 723/1030 | 795/BET 8800 | Buy part |
| STEM, FEMALE OA 8.35 | 360/454 | 360/BET 8800 | Buy part |
| STEM, MALE | 360/348 | 360/BET 8800 | Buy part |
| STEM, T10 | 200/1514F | 401/BET 8800 | Buy part |
| STEM, T6 THREAD 1.20 | 200/1474F | 401/BET 8800 | Buy part |
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