Hello, based on my personal experience I would highly recommend http://findmanufacturersupplier.com , they handled my entire production process when I started with little MOQ, they not only do fashion manufacturing so they should be able to do pins as well. hope this helps :)
We are a small ethical clothing manufacture based in Bali, Indonesia.We specialize in production for small to medium-sized companies, with low MOQ. We can produce by your sketches, pictures or samples. Our services include pattern making, grading, sample making, fabric purchase, production, door-to-door delivery by international express. We also do manual screen printing.
Any enquiries, please contact me firstname.lastname@example.org