The D6-class was a type of battlecruiser which saw service in the Klingon Empire in the early-to-mid 23rd century. In the 2240s, the D6's began to be replaced with the more efficient and advanced D7-class. (TOS - Enterprise Logs short story: "Though Hell Should Bar the Way")
Despite this, however, the appearance of the hull was seen again in the later part of the 23rd century in the form of the Relentless-class light cruisers. (TOS video game: Klingon Academy)
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