So an 07 Valor would probably stand around the price of the Gaze and Shako, close to 40, as an estimated appraisal you'd think? Or is Valor lower value than Shako/Gaze and closer to other 07 items?
I guess it all depends on the trader. All the 1.07 uniques have the same rarity in terms of racking. And, they all have various "upgrades" on 1.13+ versions or offer something entirely unique like Valk Wing. From my estimation,
relative values for 1.07 uniques mostly the follow the usefulness of the 1.13+ version of the item.
Meaning: 1.13+ Shako is pretty ubiquitous. So, ANY upgrade over a 1.13+ version is valuable. However, 'Enigma', 'Chains of Honor' etc. generally limit the use of 1.13+ AV or Skullder's. So, even though the 1.07 versions of the armors offer big upgrades on their 1.13+ counterparts, they are still overshadowed by people's preference for the OP RWs. Likewise, 1.07 Grandfather is pretty cool, but we don't see many players running around with 1.13+ GFs, do we?
Personally, I actually prize the not often used items for their potential to "unlock" new builds/setups. Titan builds with 1.07 AV are all of a sudden much more manageable. 1.07 Hellmouth gloves don't really turn heads, but offer CBF which can offer another setup option instead of the standard Raven Froat.
But, generally speaking, I think you're correct. Shako is probably the most "expensive", followed by Valk/Gaze, AV/Skullder's, and then on down.