Clock
FIG. 1 is a front elevational view of a clock showing my new design; 
     FIG. 2 is a right side elevational view thereof, the left side being a mirror image thereto; 
     FIG. 3 is a rear elevational view thereof; 
     FIG. 4 is a top plan view thereof; 
     FIG. 5 is a bottom plan view thereof; 
     FIG. 6 is a front perspective view thereof in a wall-hung position; 
     FIG. 7 is a right side elevational view of FIG. 6, the broken-lines of a wall being environmental only and forming no part of the claimed design.