Well Preserved Red Submariner ref 1680 from 1973.  The dial is MK4 variant and clean and the hands were color matched at some point.  The case is worn but appears to be unpolished and all numbers are clearly visible.  The bezel is sharp and the original insert has faded to a blue grey tone.  The bracelet is a 9315 / 380 with 10 links plus diver extension and was probably retightened in the past as it has very little stretch. The movement was recently serviced and it is running perfectly and the crystal was also replaced during service.