Some diecast cars are created by professionals, meaning companies that specifically create custom Buick Grand National 1:64 die cast vehicles.
Generally made in limited quantities (as opposed to “HotWheels” type cars that are massed produced in the millions).
Then there’s individuals who make Buick Turbo Regal scale automobiles.
Also supplied in minimal amounts, but usually are one-off designs as far as paint jobs go, or perhaps these designers swap out wheels or other parts to customize them.
Both of these styles are equally creative efforts, and one isn’t necessarily better than the other, since beauty is in the eye of the beholder.
If you like them, put them in your car collections.
(from ebay, etsy, amazon, facebook, and many other online sources)
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Here’s a custom painted HO scale (like for electric train layout displays) that has a custom two-tone paint scheme (ALA a reversed WH1):
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