I have already submitted this bug report three times between 2011 and now regarding the weapon color models being incorrect. Unfortunately, the issue still hasn’t been fixed.
Back in Wrath of the Lich King, there were four one-handed swords that shared the same model but had different colors.
The change to the models happened around late 2010 / early 2011. At the time, a player reported that this change came with Patch 4.0.3a – the Cataclysm pre-patch.
With the new expansion allowing Survival Hunters to once again equip one-handed weapons, I am trying once more to get this issue fixed and bring some attention to it here on the forums.
There are four weapons that originally had different colors.
After a patch, all of them were set to the same color, and the issue was never corrected.
You can clearly see the different color variations in the screenshots on WoWhead.
However, in the model viewer, all of them show up with the same color.
I can confirm this: both the original items stored in my bank and their transmogs – all four weapon models display as blue.
Normal Weapon:
→ Blue
Normal Off-hand Weapon:
→ Green
Elite Weapon:
→ Red
Elite Off-hand Weapon:
→ Dark Blue