I know that's extremely off -topic, but could you please tell me the name of the shop? I'm currently getting into leather stamping, and the quality of dies has been rather hit or miss, so I was to cautious to buy a custom one until now.

Not at all, I ordered at the LiSaDuPu Store (https://www.aliexpress.com/store/912251155). I had a 60 mm outline of a water lily leaf (https://en.wikipedia.org/wiki/Seeblatt) made, and the die seems alright. I've done around twenty of those now in 7-8 oz leather, so no idea about its longevity, but it's cheap enough to warrant experimenting. The die itself accurately reproduces the PNG I sent in the chat to the store.

To use the die I'm using a one ton arbor press. That's not enough force to push a die of that size through in one go, but after the first press I can move the die and the leather around the outline and finish the cutting with a few light presses all around.