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Brand: | STP | 
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|---|---|---|---|
| Family: | |||
| Height: | 3.70 mm | ||
| Jewels: | 20 | ||
| Reserve: | 44 hours | ||
| Frequency: | 28800 A/h | ||
| Winding: | Hand winding | ||
| Diameter: | 25.60 mm (11.5 ligne) | ||
| Complications: | Date, Hacking Seconds, Hand Winding, Quick Date Correction | ||
| Hands: | Central Hour Hand, Central Minute Hand, Central Seconds Hand, Date Window at 3:00 | ||
| Distinguishing Technical Characteristics | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
 Hand-Winding  Clockwise Balance Cock  Screw Regulator |
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| Production: – | |||||||||||
| 1910s | 1920s | 1930s | 1940s | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
STP1-11M is a hand-winding watch movement from Swiss Technology Production. It is a replacement for the ETA 2804-2 and uses the same wheel architecture. STP uses a longer, thinner mainspring, boosting power reserve to 44 hours. It also includes three extra jewels.
STP may have used an ebauche from Sea-Gull in China to build the STP1-11 family. Photos on the company web site previously included the label, “ST2100”, which is the identifier found on the Sea-Gull ST2130 movement. The same has been said of the Valanvron VAL-24. Due to their Swiss content and finishing, STP can legally classify these movements as “Swiss Made”, and the company may now construct most or all of the movement in-house.
Cal. STP1-11 is an automatic version.
STP1-11 Movements
| Complications | Hand-Winding Calibre | Automatic Calibre |
|---|---|---|
| Standard | STP1-11M | STP1-11 |
| Swan Neck Regulator | STP3-13 | |
| Outer Day-Date | STP4-13 | |
| Open Heart | STP5-15M | STP5-15 |
| Skeletonized | STP6-15 |