The Government Flying Service (“GFS”) is a disciplined service of the Government of the Hong Kong Special Administrative Region. Over the years, members of GFS have been committed to serving our community and the Government, through dedication and teamwork, by providing world-class aviation support. Under the theme of “Government Flying Service – Operations”, Hongkong Post will issue a set of six stamps and a stamp sheetlet to illustrate the major operations of GFS and the types of aircraft in its fleet, enabling the public to gain a better understanding of its aviation services.

$5 – Internal Security
GFS offers support to various disciplined services in their discharge of duties to maintain the internal security of Hong Kong, resulting in better efficacy in tackling potential threats of all kinds. The Airbus H175 Cheetah Helicopter showcased in the $5 stamp is the newest GFS aircraft. It is installed with state-of-the-art equipment to meet the needs of internal security and diverse missions.
https://stamps.hongkongpost.hk/eng/news ... 90130a.htm
The $5 stamps shows also a patrol boat of the Hong Kong Police Force, the no on the wheelhouse gives her as the PL6 56 DETECTOR.

PL6 56 DETECTOR:Protector (Pacific Forum)-class small patrol boats are vessels built and used by the Hong Kong Police for marine patrols off Hong Kong. They are based on the Pacific class patrol boat built in Australia for several Pacific island nations. Commissioned in 1993, six boats were delivered and in service: PL1 51 PROTECTOR, PL2 52 GUARDIAN, PL3 53 DEFENDER, PL4 54 PRESERVER, PL5 55 RESCUER and PL6 56 DETECTOR.

Class overview: Name: Protector (Pacific Forum) class small patrol boat. Builders: Transfield ASI Pty., Limited, South Coogee, Western Australia, Operators: Hong Kong Police, Built: 1993, In commission: 1993, Completed: 6, Active: 6. General characteristics: Type: small patrol boat, Displacement: 170 tons, Length: 32.6 m (107 ft), Beam: 8.2 m (27 ft), Draught: 1.6 m (5.2 ft). Propulsion: CODAD: 1 Cat cruise diesel, 1 waterjet, 775 bhp; 2 Cat boost diesels, 2 shafts, 4,400 bhp, Speed: 24 knots (44 km/h; 28 mph), Complement: 19. Armament: one 12.7 mm machine gun, two 7.62 mm machine guns.

https://en.wikipedia.org/wiki/Protector_(Pacific_Forum)-class_small_patrol_boat
https://www.flickr.com/photos/acstudio/5406606110
Hong Kong 2019 $5 sg?, scott? (The photo shows a sister the 54)