18.75 x 8.25 CISA WC CH CHILE Briggs 2240-CH 2240 toilet tank lid top
CISA or Briggs Toilet tank Lid. usually has 2240 or 2240 CH on the bottom but a lot of these CISA lids have no numbers on the bottom. Off of a tank that commonly has 2240 in the bottom, made in Chile.