Hello,
By looking at the user guide, around the middle of 1998.
Here is a link to the user guide if you are interested:
HP DesignJet 1050c User Guide
At the end of it, it says that the first edition was July 1998, so the printer was no doubt released around that same time.
Thanks for using Fixya.
Oh, and should you download that manual, be patient. It is over 14MB.
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