It would be a great help if you told us what measures you have taken, to try to have the watch repaired. Who told you a capacitor leaked? Sounds as though your circuit may have cratered.
There are two alpha-numeric numbers on the bottom of the dial, separated by a hyphen. The first four numbers identify the movement caliber. Your watch likely needs parts, and parts for older Seiko quartz can be tough to find. Post the numbers from the dial and maybe somebody can help. Too much plastic in quartz watches, and the plastic breaks up over time, rendering the watch virtually unrepairable.