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At first I thought it was 3592.50 which has 863 movement and same caseback, but the dial isn't the same as a 3592.50 Also 345.0808 had similar case back.
Get the Heritage department , was a standard speed from 1981 delivered to Lebanon , the guy told me his father change the dial and case back and bezel. Y the gold ones, all explain now, this dial still a misterious thing.