Possible birth year purchase... 1984 Speedmaster?

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My question is how is he dating it to 1984? Without an extract or warranty card these are super hard to date in this time period. Serial numbers are not able to date these to within a year.
 
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Indeed, I have a nice 48 million serial Speedmaster that "reliable" sources have placed anywhere from the mid-80's to the mid-90's. The problem with these is that they're not (yet) collectible enough to make it worthwhile getting an extract.

You might have a little more luck with a birth year Rolex---there seems to be a little more agreement on serial ranges for these.
 
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@wsfarrell I dont quiet belive that yours 48mio is so unaccurate dated (10years span). Send picture and production date can be dated better that 10years span by help of mwo and charts online.

For OP: i checked ad and according to mwo this example was made between 81-88. For more detail year(not exact but close) will need to see pic of movement and serial.

Mwo: model was in production 81-88
Dial c3 from 77-91
Bezel b2 from 70-90
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