Limited edition of 299 pieces u boat watch chimera pvd mother of pearl 8031 like many other u boat watches this u boat chimera ipb mother of pearl watch combines some of the most exquisite gemstones alongside robust stainless steel to create a timepiece that not only looks incredible but is completely durable the bold 40mm stainless steel case houses the u 28 automatic mechanical movement which promises a water resistance of 100 metres and an impressive power reserve of 38 hours the bulk