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·I'm new to this forum. I own a Speedmaster Profesional 311.33.42.30.01.001, that I bought new. This is the first time I'm looking to buy a used watch. I'm looking at the 3511.50 and I found a bunch on ebay and online retailers. I'm thinking about buying it and then sending it to Omega for maintenance. Please help me decide which one to buy and the best way to go. Thanks.
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