It is confusing, not helped by the fact that OR appeared on the TT decal of the Race and Racelite.
They are all off road bikes, and show their lineage with that decal (like the CX). However, the OR was a model in its own right, and predates the other two.
when the Race and RL arrived the OR model designation was dropped.
OR giveaway is the horizontal dropouts, riveting / glueing , and bisected stays.
That one is a little later in to production, I'd say 90/91, as it's missing the pump bolt. The OR evolved quite a lot over it's production life, early ones being brazed, and mine's a hybrid braze and Tig model.