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I believe model number is a better indicator rather than serial number. Go to settings, general, about. First letter generally as follows:

"F": refurbished unit
"M": retail unit
"N": replacement unit
"P": personalized (engraved) unit

Also, this should provide a complete manufacture history of the device:
http://www.chipmunk.nl/klantenservice/applemodel.html
YOOOOOO!! I got N first letter in modell number. Thank yoouuu
 
For me refurbished mean that somebody used it before me and maybe will faster some parts of the ipad go wrong

Not necessarily true. Especially, with Apple refurbished item, the casing, screen and battery gets replaced. It might be that the motherboard was used for a bit but that doesn’t really make much difference because that motherboard was used in the factory as well for testing and it passed. So you’re good to go.
 
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Just noticed my replacement device is an N. Considering it arrived in a white box and had iOS 10.3.2 installed, I'm guessing it was new.
 
Another post ... in post #60 I noted my replacement was an N. Just found a dump of the settings for the initial replacement that was also faulty, and that was an M (listed as a retail unit above), so not sure how accurate this first letter thing is now.....
 
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Another post ... in post #60 I noted my replacement was an N. Just found a dump of the settings for the initial replacement that was also faulty, and that was an M (listed as a retail unit above), so not sure how accurate this first letter thing is now.....

It could be that the initial replacement occurred so early in the model cycle that no N units were yet designated, and a retail unit at that point was used.
 
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