t's not easy to get good deals in Jakarta, as I think it is a seller's market for popular high end watches like PP, AP and Rolex.
But once in awhile if you are a local and you know the who's who in the pre-owned market scenes, you might get offered quite good deals on some popular models.
Blok M Plaza has numerous stores who are specialized in this type of business. They have been there for many years and I haven't heard problems buying from them. I had one experience only and it was satisfactory.