|Winding:||Automatic, Bi-Directional Automatic 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|
|Production: 2016 – Current|
STP3-13 is an automatic watch movement with swan neck regulator from Swiss Technology Production. It is based on the popular ETA 2824-2 and uses the same wheel architecture. STP uses a longer, thinner mainspring, boosting power reserve to 44 hours. It also includes an extra jewel on the barrel arbor. Cal. STP3-13 first appeared in the STP catalog in 2016.
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 a similar movement without the swan neck regulator.
|Swan Neck Regulator||STP3-13|