Reverend Rob
Posted February 8, 2014 - 3:54pm
17 jewel watches should be jewelled straight through to the center wheel. A 15 jewel watch won't have the centre wheel jewelled, but will rather have a brass setting, or simply a hole in the plate with an oil sink. Chatons are brass settings holding jewels, and may be pressed in, or in older watches, held in place by three tiny screws.
I think what we're seeing here is jus a reflection of light on the centre jewel?