I had a pretty good magic dagger, but it broke. Without any working repair, I sold it to a vendor. I had to replace it with a normal version of the same type. I use that one for a while, and it's now down to 5 durability itself.
I go back to the vendor I sold my magic dagger to, and she still has it for sale - only NOW, it has 80/80 durability. Naturally, I bought it... only to discover that once it was in my inventory, it was in fact at 0 durability, not 80.
