RuneScape Classic Wiki
RuneScape Classic Wiki
The main RuneScape Wiki has an article on: Damaged armour
The Old School RuneScape Wiki also has an article on Damaged armour.

Damaged armour can be found by digging level 2 sites in the Digsite. There are two variations with the same name.

If using Damaged armour1.png on Archaeological expert he will say: "Hmm... unusual. This armour doesn't seem to match with other finds. Keep looking, this could be evidence of an older civilization!".

The other armour Damaged armour2.png gives this response: "It looks like the wearer of this fought a mighty battle".