Just a couple of philatelic covers from Labuan. Commercial mail must be really uncommon.
This is SL7 in Proud's text confirmed by a back stamp of a Labuan cds of 5 Jun 56. Proud only recorded a solitary date of 27.8.54.
The one line paquebot cancellations were largely superseded in North Borneo between 1956 and 1958 by the advent of the star cds type cancellations such as this.