According to Google, the 5131J debuted in 2008, the 5131G in 2009, the 5131R in 2014, and the 5131/1P in 2017. To my eye, it is striking how much the detail of the enamel work improved over that time.
all four of them ! Each has a special meaning to me. G & P were produced by Anita Porchet and her team. R has the most meaningful map to me, whereas J was my first love when it came out.