Buying pre-used in the untested market / environment esp. in the mall need a lot of guts. And you have to know your wares through out. My safe bet is to buy from a reputed dealer.
I agreed with ck, the watch in question would probably a speedy reduced. I have owned this model and quickly disposed it when I found out the cost of parts replacement - where it comes in a sets of gears instead of just replacement of just one piece..
my 2 cents
dc