ROLEX REF. 6609 DATEJUST THUNDERBIRD YELLOW GOLD Rolex, "Oyster Perpetual, Datejust, Superlative Chronometer, Officially Certified," case No. 148742, Ref. 6609 (reference no longer visible between lugs). Made in the late 1950's. Fine
Cool Rolex of the Day #1058: 6609 Datejust Turn-O-Graph "Thunderbird" with no lume, steel with white gold bezel, 36mm. Circa 1956 : r/rolex