If it is a high quality article the original pins could be made of silver, from silver wire, or silver-plated brass, to avoid corrosion. You would be very lucky to find just what you want now, but it is possible to make something yourself from ordinary tailors straight pins. Decide on the length you need, and cut them off, grip them with a pair of long-nose pliers and with a small fine-cut file give them a few strokes to form a new point. If you are replacing the leather you will need to make a starter hole with a fine brad awl, or something similar, and you can hold them with the pliers to get them started.