Burnished Quel'Serrar (http://www.wowhead.com/?item=49495) is such an item for me when working on my Prot Pally with Rawr.
It shows up in the item database, I also added it manually, but it doesn't show up in the comparison panel, even if I set the filter(s) to "ALL". And yes, I did check if I have chosen 1h-swords to be shown too.
If I'm already here, I got another question:
Did Ony 10 man the other day, and because we had no caster in the raid I took the Glinting Azuresong Mageblade (49298) for my heal gear. So far I used Ice Spire Scepter (#40488).
Of course I know that the Mageblade is a caster weapon an normally not used by Healadins, but it is still much better than the Scepter, but doesn't show up in the comparison list too. Is that simply because it's initially a caster weapon (with hit on it)
and not showing up in the Healadin modul, or is it the same problem as stated above with the Burnished Quel'Serrar?