MIL-PRF-46374G
numbers of rejected watches shall not be repeated. For class 3 and 4 watches, the manufacturer's
name and model or grade number shall be marked on the movement (barrel bridge, train bridge or
both).
3.4.9 Case.
3.4.9.1 Battery servicing. For type I classes 2 and 3 and types II and III classes 1, 2, and 3
watches, the power cell shall be replaceable without damaging the watch such that it would not be
able to meet all the performance characteristics of 3.5.
3.4.9.2 Finish and color. All visible exterior surfaces of the case assembly, excluding control
switches and spring type case bars, shall have a dull non-specular/non-reflective finish. The color
shall be silvery metallic or black as specified in the acquisition requirements (see 6.2).
3.5 Performance characteristics.
3.5.1 Vibration. While running, the watch shall not be damaged after being subjected to the
vibration environment of table I.
3.5.2 Shock. While running, the watch shall not be damaged after being subjected to the shock
environment of table I.
3.5.3 Storage. For class 1 watches, while running, the watch shall not be damaged after being
subjected to the storage environment of table I. For class 2 watches, both the watch and its
battery (battery not installed) shall be simultaneously subjected to the storage environment of
table I. For class 2 watches, at the conclusion of the storage test, the battery shall be installed in
the watch and the watch shall run without any evidence of damage. For class 3 watches, the
watch shall not be damaged after being subjected to the storage environment of table I. Class 4
watches shall not be run during test.
3.5.4 Water resistance. The watch shall show no evidence of leakage after being subjected to the
water resistance environment of table I.
3.5.5 Water leakage. While running, the watch shall not be damaged after being subjected to the
water leakage environment of table I. After the watches are removed from the water, if there is
any water in the crystal bowl at the completion of the test, it shall constitute a failure of the water
resistance test. (This test may be done concurrently with the radiological diffusion test in 3.6.3.)
3.5.6 Synchronization. The hour hand shall indicate the correct time within ±1 dial graduation
when the minute hand is at 12. To determine compliance, the setting mechanism shall be
activated and readings taken when the minute hand is at 12 and the hour hand is at the 3, 6, 9 and
12 hour positions respectively.
3.5.7 Magnetism. While running, the watch shall not be damaged after being subjected to the
magnetic environment of table I.
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