Mechanical watch movements are amazingly intricate feats of small-scale engineering. This Seiko NH36 Movement Kit lets you learn how to build one yourself. The movement itself is a mechanical, automatic variety with over 50 pieces, a day/date function, and movement for three hands, and arrives assembled to protect the parts during transit and ensure proper lubrication. An included guide walks you step-by-step through disassembly and reassembly, explaining each part and its purpose along the way. Also included are a movement holder, case, and all the tools you'll need for the job, along with support from Rotate should any parts need to be serviced or replaced. Once assembled, it can be used with various aftermarket hands, watch cases, and more to complete the ultimate mod.