Posting photos is the only way to get some help, but I believe the 1601 wasn't introduced until the late 1950s. So your watch can't be from 1949 if it is indeed a 1601. I also think you missed a digit on the serial number. Maybe the bracelet rubbed it off. But I'd guess it's from late 1979 or early 1980 if you correct on the first three numbers.
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Rolex GMT Master II 116710LN, Oyster Perpetual 114300, Datejust 16233
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