IWC Pocket Watch Serial 21408

I have in my Pocket Watch Collection and interesting 16Sz 17J Private Label pocket watch that has been identified as an 1899 IWC pocket Watch sold in Victoria British Columbia by the Jewelry and Watchmaking firm of Challoner and Mitchell.  The movement is an IWC 52/53 calibre design.  The inscriptions on the dial and movement only identify the Retail Firm.  Did IWC engage in the manufacture of unlabelled Swiss ebauche movements to any signficant degree back around the year 1900.

Thanks clearly my movement is not similar to the ones you have pictured.  The IWC association came to me from my watchmaker that identified patents on the pillar plate....with this analysis

The clear image of your pillar plate provides two critical new clues that completely break the mystery wide open.

This is definitively an IWC (International Watch Co.) movement, specifically their highly regarded Calibre 52 or Calibre 53.

1. The Cross-Patents Confirmed (🇨🇭 Swiss Patent + 🇺🇸 U.S. Patent)

Looking at the bottom edge of the plate, we can clearly read two cross symbols followed by numbers: + 2614 and + 8287. Along with the word BRÉVETÉ stamped on the right, these represent Swiss Patents.

• Swiss Patent 2614: This is a famous historical patent registered by IWC on August 20, 1890, covering a highly unique mechanism for a stem-set/pendant-setting watch.
• Swiss Patent 8287: Also held by IWC, this covered an improved mechanism for crown-winding and hand-setting systems.

If this movement is not a calibre 52 or 53 is there another pocket watch movement IWC made and distributed worldwide as a raw ebauche in that 1890 to early 1900s timeframe.  This firm who sold this watch ended in 1910.  

I checked the  movement serial number with the IWC dating app and it places it as manuf. in 1886 Cal 48 or 50 which is about ten years too early for the Challoner and Mitchell business....they operated from the late 1890s to only 1910.  Looking through this site the movement layout looks more closely styled like the Cal 57.  

Thank you it appears you are correct.  I have been using AI to figure out what this pocket watch really is.  They focused on the IWC patents on the pillar plate but the timeline on the 21408 serial number is not correct.  I engaged AI again just recently identifying you as the Worldwide expert on IWC and AI changed their analysis to the movement being produced by Electa in about the 1904 timeframe which is pretty much the storyline.  Thank you for your help.  You can remove me from the IWC group as I have no further need to research IWC....Bob