This is a 9ct gold pocket watch in a C.N case and the movement stamped SS&Co with the three triangles. Is this an IWC movement? Any help appreciated. Cheers Russell.
I suspect it is a Cyma 17-30 movement. Compare it to the one in the image from the Ranfft archive. The plate layout is a bit different to yours, because the same basic movement can be used in a hunter case, or open faced. So the caliber for yours might differ a bit. Is there a prize!