From now until 30 Sep 2018, use your American Express Platinum Card at IWC and earn up to 11.7 mpd with your purchase.
Note that this promotion is only valid at the IWC Schaffhausen Boutique at ION Orchard and Marina Bay Sands. Also, this miles earn rate is only applicable to the first S$16000 spent within the calendar year, following which you’ll only earn 3.9 mpd.
More information can be found here.