Re: One Word....
Momentum NEVER changes. It's one of the more immutable laws of the universe, and it can only be transferred. In general, the harder the object the watch strikes, (and the more massive), the greater the amount of momentum that will be bounced from the watch, into the substrate, and back into the watch in the opposite direction. the hardest objects have the least deflection (by the defintion of hardness), and thus are almost perfectly reflective of the momentum of incoming objects. Once again, however, G force is deceleration (or reacceleration in the opposite direction) over time.
Also, as far as a real life example, I haven't been able to find aything useful, and I have to believe that the citation of Michael Schumacher going 150 MPH into the wall would be a top limit NO ONE (Including me AND Chuck Maddox TOGETHER on one of those little clown bicycles going off a jump during the X games...) could ever top due to any sort of human related fall. The figure cited is 30 MPH = 20 G with seatbelts, so for 150 MPH it would be 100 G. That's so far South of the 5000 G limit as to be neglible.
I think the worst case scenario is an Omega, BY ITSELF, falling off a bathroom countertop onto a ceramic tile floor with a concrete base underneath it, such as in a hotel, athletic club, or other concrete structure. Whether that's over or under 5000 G's I don't know, but my gut says it's probably in the same ballpark.
