Captain Klaa's Bird-of-Prey
Caption: Klaa's ship, with Kirk in its sights
Caption: The periscope descends
Caption: Klaa takes aim
Caption: Target practice with an old, Earth space probe
What distinguished Klaa's Bird-of-Prey was its unique periscopic targetting system, which allowed the Klingon commander, from his command chair, to physically sight and target his prey.
Upon firing weapons on the target, the periscope would retract into the bridge ceiling.