FP1600 - Design Change

There was a design change for models FP1600B, FP1700B, and FP1800B on April 2014. The new design would no longer require a workbowl coupling. All parts should be interchangeable except the chopping blade and disc stem. The date code would be needed to determine if this is an old or new design. Anything after date code 1450HA would be the new design.