How can I find the manufacture date of a laptop without the service tag to ask Dell?

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How can I find the manufacture date of a laptop without the service tag to ask Dell?

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No service tag visible on a Latitude CP and a Latitude CPi and I'm trying to find out the manufacture date of each.  Thanks

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  • Why does it matter?

    Those are very old laptops that most likely came with Windows98.

    my Dells:
    Precision M6300 - XP SP3 / Windows 7 / Ubuntu 12.04
    Latitude D620 - XP Pro SP3
    Precision M6300 - Windows 7

  • It matters as in that I have a chance to sell them and depending on the date of manufacture will tell the amount, and yes, they came with Win98