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We know it was put into service at least as early as 2344 (probably earlier), when the Ambassador-class Enterprise-C was known to be in service. It continued to be in use as late as 2375; I don't believe it ever showed up in Star Trek productions set after that, though likely it was still in use. Consider that the Excelsior-class, the prototype for which was mostly completed in 2286, was still in heavy use as of the late 24th century (2375 again being the last recorded appearance). Likely the Ambassador-class was similarly serviceable enough to continue in active use for as long, if not longer.

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