Honda's text that went alongside the bike is below. They did a good job of matching that bike along with the HRC Honda bikes for the weekend.
1973 RC250M ELSINORE
As Honda's original dedicated motocross machine, the 1973 CR250M Elsinore found instant success on the track. Gary Jones won the opening AMA Motocross National of the season aboard a factory version (hence the "RC" moniker) and went on to win Honda's first MX title. This was just the beginning of Honda's success in motocross.