Is Epidendrum Ballerina a hybrid or a variation

[Fairorchids]

While we can't be 100% certain, the fact that it is sold under a hybrid name, makes it 99.9% likely to be a hybrid.

In the early days, the RHS did accept some registrations where 1 or both parents were unknown.

Prior to better record keeping (about 1930?), the registration date is always shown as January 1st.

Species identification in the reedstem Epi group is notoriously 'vague', as there is interbreeding in nature, so even a DNA analysis might not provide a clear answer.

The fact that it is still around attests to how vigorous these plants are. Then again, it is possible that there has been a remake (something x something else), or more likely a selfing, and the offspring was given the recognized commercial name of 'Ballerina'.