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3400 G for 0.0065 s corresponds to stopping from 220 m/s in 0.7 m. Realistic impact speed and a rather small, but not unrealistic, deformation zone. (It can also be noted that these black boxes are orange.)
How much can a watch be subjected to? Let's say (I don't know the real numbers, so this is theoretical, but I think within the bounds of the reasonable) a heavy watch drops from 1 m height to a soft floor so the "deformation zone" is 1 mm. That's 1250 G. If the floor's hard so the watch stops in just 0.1 mm, that's 12500 G.
Do we think that dropping onto concrete floors from tables is more than twice as much as for instance NASA demands? Not I! Which goes to show us that the number of G:s *alone* doesn't tell the whole story.
In the floor example with an impact speed of 5 m/s the stopping distances are so short that much of the shock can be absorbed internally without any permanent deformation. The same number of G:s for a slightly longer time may more easily cause permanent deformation.
I don't know what the DIN 8308 standard for shock resistance says, but there are several manufacturers who say their mechanical watches passes it.
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