Joining three other World Time watches available from Patek Philippe comes the new ref. 5231J in yellow gold. in 2016, Patek Philippe presented the new World Time ref. 5230 replacing all previous models. The changes at the time included subtly reworking the case, the dial, and the hand designs. Two years ago, Patek Philippe released the World Time ref. 5131P in platinum with rice bead platinum bracelet and the watch was an absolute success. Now, this year at Baselworld 2019, the 5231J in 5N yellow gold joins its siblings the 5231G and 5231R in 5N white and rose gold respectively.