Not, unfortunately, a picture of Opal, but a close lookalike.

DAYTON, ILL., COW COMPLETES TEST

Dayton, Ill., July 16. — Opal of Greenacres, 569949, a pure bred Jersey cow in the herd of L. A. Green, at Dayton, Ill., has completed an official production test. Opal was started on this test at the age of 4 years and 11 months and in the following 365 days she yielded 549.86 lbs. of butterfat and 8,109 lbs. of milk. Her milk averaged 6.78 per cent butterfat for the year and for two successive months of this test her production of butterfat was above 63 lbs. per month. With the above record, made on two milkings a day, Opal of Greenacres qualified for the Register of Merit of the American Jersey Cattle Club. Her sire is Master of the Sea 183761, and her dam is Mayfield’s Spotted Maid 351671.¹

1. The [Streator, Illinois] Times, July 16, 1928, p. 2.