1. General Motors Holden (GMH)
It is most commonly associated with General Motors Holden, the Australian car manufacturer known for producing iconic vehicles. The owner may be a fan of Holden cars, an enthusiast, or have a personal or professional connection to the brand.
2. Personal or Business Initials
The letters could represent the owner’s initials or those of their business. For example, a person named "Gregory Mark Harris" or a business named "GMH Enterprises" might choose the plate to personalise their vehicle.
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