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Quartic twist y^2 = x^3 - 252x. Found in a bounded exact small-coefficient sweep over every nonzero integer A with -300 <= A <= 300 in y^2 = x^3 + Ax. Each curve was exactly minimalized and compared by c4:c6 identity against the current ICARM database. PARI/GP 2.17.4 returned rank bounds [2,2], rational torsion Z/2Z generated by [0,0], conductor 14112 and minimal discriminant 1024192512. Exact quadratic-character certification at 9 good primes gives an F_2 matrix of rank 3 with torsion-row rank 1, proving the two submitted points independent modulo torsion. No novelty claim is made beyond absence from the checked ICARM snapshot and this bounded search.