Looks like a good idea to strengthen a leather seam.
The front cover of the heavy duty 19th century binding found on the 1561 Basel edition of Georg Agricola's De re metallica
Handmade leather blue butterfly wallet leather zip women clutch Tooled
Leather coin case - Animal Kingdom:
Coin Eating Cats by Yohi & Olivia
Leather credit card wallet/ Card case /Card holder/Personalized Card case/ Slim Card Case on Etsy, ฿716.67
iPad case, kindle case, shoulder bag Hungry Cat