Joining the other limited editions of the Audemars Piguet Royal Oak Perpetual Calendar comes now a 300-piece limited edition in titanium with a salmon dial. Some of the other limited edition pieces include the 50-piece limited edition in platinum with ice blue dial for Switzerland, the 100-piece in pink gold with pink-toned dial for Latin America, the 50-piece in stainless steel with a green dial for Hong Kong…