77deluxe
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What model is it?
1930 Rolex Prince Observatory duo-dial "doctor's" watch. Note the over-sized sub dial with prominent minutes chapter ring. Adjusted to six positions, micrometer regulator, 18-jewels. The only one I have ever seen that is a chronometer version. Gold filled case. I am the second owner. Same movement as used in the Gruen version. Movement by Aegler, I believe.