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Obtained by a rational 3-isogeny from curve #4873, submitted by Daniel Błażewicz: https://elliptic-rank.icarm.cloud/curve/4873. The source model is y^2 + y = x^3 + 31. Its public entry supplies one rational point and no commentary identifying an earlier source. Completed the square with Y = y + 1/2, giving Y^2 = x^3 + B with B = 125/4. Applied the standard degree-3 isogeny X = (x^3+4*B)/x^2, V = Y*(x^3-8*B)/x^3, then set y' = V - 1/2. The resulting integral model is y'^2 + y' = X^3 - 844. One supplied rational point transported through this map and checked exactly on the target curve. Rational torsion trivial. Same rank and conductor as the source; conductor 675. Source-attributed existing curve.