Cog is a new design here rendered in polished rhodium finish. This design takes its inspiration from the world of engineering. The ubiquitous and ingenious cog wheel invented by Archimedes. Where would we be without it? This design has a \'whale-tail\' backing which is similar in form to a solid, fixed toggle except the rear part of the finding swivels to lie flat against the shaft for easy insertion through the cuff. A must have for those who, like me, appreciate the beauty and elegance of engineering applied to movement