Repop womb chair
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I don't know the term "reop" but I'm assuming it means a knock-off or imitation? I've heard people use the term op-shop in New Zealand for second hand stores, but not the term re-op.
Are you asking what to look for in the future in regards to Womb chairs? A Knoll label (or Vitra if you are outside the USA) would be the first thing and the sheer quality would be the second. Vintage Knoll furniture is of exceptional quality and it is easy to recognize, esp in comparison to knock-offs. A real womb chair is HEAVY, solid and usually (not always) has great hopsack upholstery. I'm sure they might be out there but I've never seen an imitation womb chair that upon inspection could ever be mistaken for Knoll production - maybe from 30 feet away but not from 5 feet. (Of course, I'm nearsighted others might spot it from 30)
If you are asking what to look for in general in the future - the answer is also quality along with good design.
Good to see you posting again. For the avoidance of doubt, Vitra don't make any version of the Womb chair, unless you're counting the miniature one that they reproduce!