Rolex, “Oyster Precision”, Ref. 6154. Made in the 1950s. Fine and very rare, large, cushion-shaped, water-resistant, stainless steel military diving wristwatch with a stainless steel Rolex buckle. Accompanied by recent service papers. Three-body, polished, screwed-down case back, straight lugs, 8 mm Rolex screwed-down winding-crown, dust-protection cap. Black with luminous round and bâton indexes. Luminous "bâton" hands. Notes Rolex Ref. 6154 The Rolex Ref. 6154 is identical in case and movement to the watches supplied by Rolex to Panerai, under the same reference number. The difference between the watch made by Rolex for Panerai and the present model consists in the dial. The Rolex dial is a traditional single plate with luminous coated indexes, whereas the Panerai dial is a two-plate dial, the first plate being coated with luminous material and the second plate pierced through for the indexes and numerals. Rolex Ref. 6154 is mentioned in the combined reference booklet sent by Rolex to their various retailers and workshops in the 1950s. According to the archives of Rolex, only 31 pieces were made of this model and this is the No. 1.