The cap is not on ebay - it is for sale by a reputable militaria dealer. And the seller is calling it a balmoral - it is me that thinks it might be something else. I don't think he is trying to misrepresent the item.
But I do get your point. It is only MY opinion that it is the same type of cap as worn by the OR's in the pictures, but I could very easily be wrong (wouldn't be the first time).
What do you think, Michael? In your expert opinion is it an officer's balmoral? Or could it be an OR's cap?