First execution Reference 73653 S has first execution dial and second execution hands, with silver dial and black registers; three registers

First execution Reference 73653 N has first execution dial and second execution hands, with charcoal gray dial and white registers; three registers

Second execution Reference 73655 S has second execution dial (wide markers and TBD on hour recorder) and third execution hands, with silver dial and black registers

Second execution Reference 73655 N has second execution dial (wide markers and 1-through-12 on hour recorder) and third execution hands, with deep blue dial and white registers