Swords were reserved for A-H subjects, and denoted award in the face of the enemy, and Austrian WWI era ribbon bars do sport swords if the ÖOEK3 had been awarded for service in hte face of the enemy. But the bar at hand is that of a German (probably: Prussian) officer, as evidenced in particular by the long service ribbon. Whilst a WWI era bestowal of the OEK3 to a foreigner would sport the war decoration, it would not have been awarded without swords. So the absence of swords and the presence of a KD device do make sense. Again, I'm not saying the bar itself is original, just that the presence of a ÖOEK3KD without swords on the bar does not disqualify it.
Kind regards,
Sandro