Old Post I know but ,Some here are saying engraving the leather will weaken it. This may be true if your engraving very thin leather, but if your engraving 4oz or more veg tan leather , engraving is not gonna really be a factor in its strength for most applications, like Holsters, wallets , bike seats what ever.
Someone wanted pictures of a used wallet. This is one I did about 5 years ago, Its in my pocket everyday. As you can see its well worn, but the engraving even the fine lines still show up very well and I'm sure will continue to do so.