OWN A PIECE OF AMERICAN HISTORY 1950 CHELSEA MARINE CLOCK CONSIDERED THE BEST QUALITY MADE IN USA.  MEASURES 7-1/4” DIA. BEZEL, 7-5/8” MOUNTING FLANGE WITH THREE MOUNTING SCREW HOLES .  MEASURES 2-1/2” IN DEPTH.  
THE BRASS CASE AND MOVEMENT NUMBERS MATCH, NUMBERS ARE 581190 .  CASE DIAMETER IS 6” FACE IS DESIGNED A BIT SMALLER TO FIT IN CASE. 
CLOCK RUNS AND KEEPS GOOD TIME .  MOST OF SILVER IS WORN OFF FACE,  SHOWING IT IS A SURVIVOR .  YOU COULD HAVE IT RE-SILVERED  IF WANTED IT IS 75 YEARS OLD.  THE SECONDS  HAND IS BETWEEN THE CENTER AND 12:00. THE CASE HAS A NICE PATINA BUT HAS CLEAR COAT MISSING IN PLACES ,  BUT STILL SHOWS NICELY.  IT IS HEAVY AS CASE AND MOVEMENT ARE MOSTLY BRASS . THANKS TO PERSON THAT TOLD ME THE DATE I LISTED WAS WRONG .  It has been corrected .