A frangible crown for a container opening, the crown comprising: - a top portion having an attachment portion; - a rivet attached to the attachment portion; - an annular skirt descending from the top portion and terminating at a bottom annular edge; - an opener assembly attached to the top portion at the attachment portion; - a frangible scoring arrangement comprising: a first scoring line and a second curvilinear scoring line characterized in that - the scoring lines (6G and 6H) are descending directly to the annular skirt from the rivet, - the first scoring line descends to the bottom annular edge and - the second scoring line trails in an opposite direction maintaining for its length a substantially equal distance from the bottom annular edge and the top portion and consists of: - an upper radial segment extending from the opener assembly to the annular skirt along a radial axis and - a lower annular segment extending circumferentially along the annular skirt in an annular direction and extending from a terminus of the upper radial segment to an end point substantially spaced from the bottom annular edge of the annular skirt. - a top portion having an attachment portion; - a rivet attached to the attachment portion; - an annular skirt descending from the top portion and terminating at a bottom annular edge; - an opener assembly attached to the top portion at the attachment portion; - a frangible scoring arrangement comprising: a first scoring line and a second curvilinear scoring line characterized in that - the scoring lines (6G and 6H) are descending directly to the annular skirt from the rivet, - the first scoring line descends to the bottom annular edge and - the second scoring line trails in an opposite direction maintaining for its length a substantially equal distance from the bottom annular edge and the top portion and consists of: - an upper radial segment extending from the opener assembly to the annular skirt along a radial axis and - a lower annular segment extending circumferentially along the annular skirt in an annular direction and extending from a terminus of the upper radial segment to an end point substantially spaced from the bottom annular edge of the annular skirt. - the scoring lines (6G and 6H) are descending directly to the annular skirt from the rivet, - the first scoring line descends to the bottom annular edge and - the second scoring line trails in an opposite direction maintaining for its length a substantially equal distance from the bottom annular edge and the top portion and consists of: - an upper radial segment extending from the opener assembly to the annular skirt along a radial axis and - a lower annular segment extending circumferentially along the annular skirt in an annular direction and extending from a terminus of the upper radial segment to an end point substantially spaced from the bottom annular edge of the annular skirt. - an upper radial segment extending from the opener assembly to the annular skirt along a radial axis and - a lower annular segment extending circumferentially along the annular skirt in an annular direction and extending from a terminus of the upper radial segment to an end point substantially spaced from the bottom annular edge of the annular skirt.