Is this a signature Item?

[_skyhopper_]

Hi, 

 

I heard about geocaching in the past but only until last week I put effort in reading what geocaching was all about.

 

Now, here I am and I already found 5 geocaches. All were micro caches except the last one. It was an ammo box with a large logbook inside. (I did not log the cache yet)

I found an item inside the cache and I took it. Now I am wondering what I need to do with this item.

I know if you take something you need to leave something else of the same "value". But I'm not sure about my find. After searching for information on this forum I believe it's a signature item. If I take such an item, should I place something back?

 

Here's a picture: