ROLEX REF. 6309 DATEJUST THUNDERBIRD YELLOW GOLD Rolex, "Oyster Perpetual, Datejust, Superlative Chronometer, Officially Certified," case No. XX8455 (partially erased), Ref. 6309. Made in the late 1950's. Fine and rare, center seconds,
Rolex Steel Big Bubbleback 6309 (SOLD) - The Vintage Concept
Rolex Thunderbird 6309 Turn O Graph Vintage Watch – Asia Timepiece Centre