It seems the 4.7 inch display Lumia with RM-1127 product code will have both Single Sim and Dual Sim variants. The latest Zauba records lists both of the variants as can be seen in the below screenshot. You can also notice the 5.7-inch Lumia 840 XL / Lumia 940 XL that we already reported.
Though, it may be somewhat related to Lumia 730 in range sporting 4.7-inch display and as the Zauba per unit price indicates may belong to Lumia 640 pricing category. Guess what it will be in comments below?
Thanks Adhithya for the tip. Cheers!!