The X-17B was a Constitution-class static test model in service to Starfleet in the mid-2260s. This model was used for testing the warp field geometry of a modified Constitution-class starship in a warp tunnel. James Kirk and Spock observed one of the tests conducted on this model. (ST reference: Ships of the Line 2009)

Based on the close similarity of this model's appearance to that of the USS Enterprise in 2266 and the uniforms worn by the officers, this model may have been tested in 2265.

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