The Revision number isn't "Saved" anywhere instead it is just generated each time you build your project (it is written into the assembly as part of the version number but not saved for future builds).
As an aside I noted a behaviour that doesn't seem to be documented anywhere (and caught me out). The Revision number seems to be generated based on the time (and not always date)!
I.e. you have v1.0.0.1234 on Day 1 at 11:00
This changes to v1.0.0.1257 on Day 1 at 11:30
But, on Day 2 at 10:00 you re-build thinking it will change to v1.0.0.1279 or similar but it actually changes to v1.0.0.0950 so producing a "lower" version number that the last build (on Day 1)?!
This doesn't always seem to happen but I would warn against using Revision as a guaranteed value to increment.