The numeral cancels were introduced in the Netherlands Indies on the 1st of January 1874. They were used by the post offices, the postal agencies of Singapore and Penang, and the expedition office on board the mail steamers. The cancel was commonly applied in black ink, but also sometimes in blue, purple, and (in a rare case) red. The numbers from 1 to 120 are known, used (according to van Leeuwen's Poststempelcatalogus) by 131 different offices and expeditions. The numeral cancels were officially withdrawn 1st April 1893, from which time the square circle cancels ('vierkantstempels' served the dual function of datestamp and obliterator.
The cancel 113 was used by two different locations in Sumatra, Bandar Klipa (1887-1889) and Tebingtinggi Deli (1889-1893). The usage from Tebingtinggi Deli is not uncommon, but only about five covers have been recorded so far with the number cancel 113 of Bandar Klipa. This one is the finest of the surviving examples. Sent to St Gallen in Switzerland, the letter went via Laboean (also in Sumatra) and the agency of Penang, and was conveyed overland in Europe via Brindisi and the Modane to Paris railway. The routing mark 'Ned: Indie over Bridisi' is of exactly the same purple colour as the Penang small round cancel on the back, so I assume it has been applied here.
I found this cover in the 2015 Asia International Stamp Exhibition in Hong Kong and knew then that it was an unrecorded example of this rare use.