I did this first wallet about a month ago:
It is made from 3 oz veg tan leather. The squid image something I found online, but I make the wallet pattern in Inkscape.
There are a couple of flaws that made good learning experiences. I masked both sides of the leather before doing the engraving and the black smudges around the squid are charred tape and adhesive that stained the leather as I was trying to remove the masking. After a few months of use, most of the marks have faded and what is left looks like normal wear and tear.
There is also an extra hole on one side and a missing stitch on on the other because I forgot to flip the outside pattern before cutting it and there are different numbers of stitches on either side.
I had to find a birthday present for an avid kayaker so I decided to make another one.
This time I made fewer mistakes and added designs to the inside as well as the outside.