STP caliber STP1-11 is a Swiss made automatic watch movement with 26 jewels. Similar to the Sellita SW200-1, the STP1-11 movement is an ETA 2824-2 clone.
Official technical documentation dates the STP1-11 as being produced as far back as November 1, 2012, although this movement was being researched and developed as far back as 2008. Modifications were made to tech sheets as recently as May 2, 2020.
STP stands for Swiss Technology Production, however, you will mostly see this manufacturer simply referred to as STP. Their website also references the name SwissTP. Whatever you call it, STP is a Swiss factory owned by Fossil Group with a production rate of about 100,000 movements per year.
STP1-11 VS STP1-11M:
There is also a similar caliber STP1-11M which is the non automatic version of the STP1-11. The manual wind version is slightly shorter at 3.7mm but has the same case fitting diameter of 25.6mm. The beat rate is the same, as well as the power reserve, but the jewel count drops from 26 to 20 without the need of an automatic wind unit.
The STP tech sheets claim an accuracy rating of -0/+15 seconds per day, operating within a max amplitude of 320 degrees and minimum amplitude of 200 degrees. Each movement is tested in 5 positions, which is comparable to the ETA 2824-2 Top grade.
We couldn’t find an official version of the STP1-11 without a calendar complication, but found a watch brand that had STP modify the STP1-11 for a no-date watch. so it is possible:
“The movement is modified to a no-date movement, all components related to the date have been removed. Upon request STP has adjusted the movements that there are only 2 crown positions, one for winding and one to set the time.” –Méraud Bonaire
As this movement is based on the ETA 2824-2, the crown functions in a similar way:
Position 1 – Manual-winding mode: Depending on the watch, this could mean the crown is pressed against the case, or on a watch with a screw down crown, it means the crown is unscrewed and in hand-winding mode. When in hand or manual winding mode, turning the crown forward (clockwise) will wind the mainspring. Rotating in reverse will ratchet the movement.
Position 2 – Date setting mode: With the crown pulled out one click, the calendar or date setting function is engaged. Rotating the crown forward (clockwise) with advance the datewheel forward. In this mode, rotating the crown counterclockwise will do nothing.
Position 3 – Time setting mode: Pulling the crown out two clicks engages time setting mode. Rotating the crown towards you (counterclockwise/backward) will advance the hour and minute hands. Rotating the crown away from you (clockwise) will move the time backward. The seconds hand will be stopped for fine tuned time setting (this is what is known as a hacking seconds hand).
While we do not have volume pricing available at this time (still need to obtain a price list), replacement prices for individual STP1-11 movements were found online in the range of $159.00 to $190.00 USD.
Caliber STP1-11 Macro Gallery:
Video of the STP1-11 in Action:
Pros and Cons:
Based on the familiar ETA 2824-2, so most watchmakers will be willing to service a watch with this movement.
Based on a workhorse movement that powers a majority of the Swiss made watches in the world.