the Gyro should be one the FCB which ifixit has not tear down yet.
ST Micro made the gyroscope.
ST Micro is the manufacture for Gyroscope. Chipworks' discovery of Invensense is based on the prototype iwatch, not the one went to massive production.
Once they have, you'll be able to view a graph of their reputation gained over time.
Here's a preview of what the graph will look like:
No reputation gained yet.