The movement in previous perpetual calendar chronographs, such as references 1518 and 2499, were Valjoux based movements, whereas reference 3970 was the first Lemania based movement used in a chronograph - caliber CH 27-70 Q. The slightly smaller movement allowed Patek Philippe to create a smaller case size, measuring to 36 mm diameter.
The 'E' in reference 3970EJ stands for étanche, french for waterproof - referring to both the solid and sapphire screw-down casebacks the watch can be fitted with. The present example is in superb condition, and an excellent addition to a growing watch collection.
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