Looks like yours is based on the caliber 1210 (1215 or 1225) which was made with numerous levels of adjustment, up to 6-positions. The subject watch is marked unuadjusted which may have something to do with the lack of the word precision on the dial. Looks like a good one! My source indicates introduction circa 1954, but I have a Rolex Royalite model with this movement from circa early 1940s. The Royalite has a 6-position movement in it. The dial on mine is marked Observatory. Yours has the KIF shock protection system on the balance staff. Mine is not shock resistant.
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