[7] He was exempted from paying customs duties on goods brought into Brunei for personal use, as per a new decree issued by Sultan Omar Ali Saifuddien III on 1 March 1956.

[9] Followed by ob 27 August, the sultan accompanied by his family, visited USS Pine Island near Sapo Point, with Pengiran Muda Hashim, and other officials, where the warship honoured their arrival with 21-gun salute.

[14] Pengiran Muda Hashim was among the dignitaries who attended the signing of Brunei's written constitution and the new agreement with the United Kingdom at the Lapau on 29 September 1959.

[19] On 20 January 1961, he addressed the public to encourage peace and unity, referring to an incident in Seria involving Malayan police and local residents, where four officers were detained for allegedly injuring two Bruneian Malays at the Roxana cinema.

[23] He was also among the distinguished guests who witnessed Brunei Malay Regiment's first-ever military parade at Padang Besar on 9 November, alongside other state officials.

[24] Following the Brunei revolt in December, Pengiran Muda Hashim, alongside other high-ranking officials, reaffirmed their unwavering loyalty to the sultan.

[27] Later in September, in the boat race held in Tutong to celebrate the sultan's birthday, he led a team of three members, finishing in fourth place.

[29] Later that year, in September, his residence hosted various ceremonies and celebrations leading up to the royal wedding of his son, Pengiran Muda Abdul Rahman, and Princess Masna.

[32] On 16 April 1967, he traveled to Kuala Lumpur with Pengiran Mohammad to represent the sultan and the Brunei government at the funeral of Tuanku Munawir, the Yang di-Pertuan Besar of Negeri Sembilan.