I am growing to learn what I was told about fakes when I first started in this obsession:
Originally Posted by Hartmut Richter
You are often not absolutely sure. Over time, one learns to absorb as much data as possible and make a probabilistic assessment. But ultimately it is a feeling inside yourself that tells you if something is true/real or not. With enough experience that feeling gains in accuracy.
... looks like someone a $50 Longines into a no value fake... oh well. It took us a while so it wasn't intuitively obvious to the most casual observer