Dumbledore's watch (was time travel is dangerous)

[vmonte]

No: HPFGUIDX 89039

Sue Wrote:
In what I have read, no one has referenced 
the watch that DD wears.  JKR has refered to it at least once (it 
seems to me) in every book.  Whether Ron is Dumbledore or not, there 
is something going on with time and Dumbledore has the answer sitting 
on his wrist.

vmonte replies:
You know Sue what a great post!  I completely forgot about DD's 
watch.  I think that may be the answer to how DD time travels.  The 
watch is different, with multiple hands, right!  I wonder if this is 
how he keeps track of all the different times he has gone back in 
time. Perhaps he has been skipping around. Doing a few years here and 
a few years there. I need to find out all the different times his 
watch was mentioned in the books. What was going on at the time the 
watch was mentioned? Did DD recently have to go back in time? 
 
vmonte again:
Did DD recently have to go back in time to correct an error? How about
Aberforth? Aberforth is in Moody's photograph. Supposedly that is the 
only time Aberforth was ever seen (at least by Moody). DD may have 
needed to come back twice to correct a mistake?