Spoilers SFA Ships & Tech

[Kamen Rider Blade]

I didn't remember this when I wrote the other reply, but I was recently looking at my FASA Trek library and I like their explanation for the DY-100 model being reused in "The Ultimate Computer." It's a more modern, automated variant named the Zeus that was designed by a fan of historical ships. The first edition of Trader Captains and Merchant Princes has a detailed stat block and cutaway but no class description, which was added in the second edition of TC.



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I swear if you blacked out the details and only looked at the silhouette, the vessel looks like a fish of some sort.

 

[Detached Nacelle]

That being said, however, I do think there's a logical upper limit and 900 years would be quite the stretch.

Out there theory but by the 2550s the Klingons were members of the Federation, this could be following a complete collapse of the Klingon Empire so following their secession after the Burn they might have just not had any ships of their own apart from relics from the point of the Empire's collapse and maybe lacked resources to make anything up to date.

Maybe Klingon space was in Emerald Chain territory so the just have pirates and raiders flying around in their fossils.