Welcome to the forum, always nice to see new posters. 
You should ask them how it’s tanned. Search the forum for leather and you’ll find a lot about this.
Short version is that vegetable tanning processes are best. Read up about chrome tanning here to find out why.
As always I’d recommend reading so much that your eyeballs want to fall out, it’s crazy how much useful information is in this forum. Here’s a good “getting started” list of stuff to read: