They are probably not that common a cancellation from the early days of Sabah, Malaysia. Both these names are no longer present in current postmarks of Sabah
The initial cancellation was a 2nd Australian type cancellation. Latest date seen (LDS) was 3 Sept. 1963. The subsequent cancellation as shown above was with the change in name from North Borneo to Sabah. This was a Type A cancellation with a EDS of 23 DEC 1964 and a LDS of 19 OCT 1971.
Sembulam is situated about 5 km to the south west from the centre of KK. The post office opened on 9 April 1973. The above so called skeletal came in 3 variations and then followed by another 3 from after 1980 without the letters for "KK". Sembulan PO was re-named Rumah Persekutuan KK on 1 July 1989.