Colo. Rev. Stat. § 42-12-302
(1) In addition to any other registration, the department may approve use of the style of original plates from the vehicle's year of manufacture for motor vehicles valued principally because of the vehicles' early date of manufacture, design, or historical interest or valued as collector's items. Original plates must meet the following criteria in order to qualify for use under this section:
Source: L. 2011: Entire article amended with relocations, (SB 11-031), ch. 86, p. 239, § 1, effective August 10.