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.