Have you ever noticed someone who you don't know but who looks so familiar that you wonder if you don't really know them after all? Some people just have one of those faces.
The same is true with watches. There are some models that look a lot like other models and you have to scratch your head to figure out what it is. A good example is the 1966 Sea Ranger II. It was made for four years but it wasn't until recently that I actually saw one first hand.