|Winding:||Automatic, Bi-Directional Automatic Winding|
|Diameter:||25.60 mm (11.5 ligne)|
|Complications:||Hacking Seconds, Hand Winding|
|Hands:||Central Hour Hand, Central Minute Hand, Central Seconds Hand, Open Heart at 12:00|
STP5-15 is an open heart hand winding watch movement from Swiss Technology Production. It is based on Cal. STP1-11, itself a clone of the popular ETA 2824-2. STP uses a longer, thinner mainspring, boosting power reserve to 44 hours. It also includes an extra jewel on the barrel arbor.
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. STP5-15 is a similar automatic movement.
|Swan Neck Regulator||STP3-13|