The closest color to speckled sussex in a bantam cochin is mille fleur.
Here is a description of "speckled" I found online: "The feathers of the Speckled variety all have a mix of mahogany and black with white tips. Sometimes the amount of white increases as the bird moults each year."
Here is a description of "speckled" I found online: "The feathers of the Speckled variety all have a mix of mahogany and black with white tips. Sometimes the amount of white increases as the bird moults each year."