10 July 1978: 4th Commonwealth Postal Administration Conference
This FDC was cancelled with the special Persidangan Pentadbiran Pos Komenwel Ke 4.
26 July 1978: 4th Malaysian Jamboree
This FDC was cancelled with the special Jambori Malaysia Ke Empat Kuching.
Here is an interesting leaflet on the original date of issue which was on 24 July 1978. I want to thank Mart Heekelaar for sharing this piece of information.
This FDC has the additional Jambori Petrajaya cancellation.
28 November 1978: 100 Years of Natural Rubber
This FDC was cancelled in Kuala Kangsar. The first rubber tree in Malaysia (then Malaya) was planted in Kuala Kangsar.
07 December 1978: Shah Alam New Township
This FDC was cancelled in Shah Alam and sent via normal mail.
This FDC was cancelled in Kompleks PKNS Shah Alam.