Strictly speaking you can't currently buy a 1171-1, that was around in the 80s and 90s, the current model is back to being named just 1171/633. Maybe that is what is confusing Omega. The bracelet has changed many times over the years since it was introduced in the early 1970s, its had screws, push pins and all manner of clasp logo designs. 1171 describes around 6 different designs.
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