What does CD mean?

[hostess99]

Hi I've just rescued a 16.3hh tb looking mare and have noticed that she has a brand on her neck which is either CD or CB there are no numbers. Does anyone know what this means? I would love to know as trying to piece together her history. Thanks everyone x

 

[Sparkles]

Only thing that comes to my head for CB would be cleveland bay maybe?

 

[Sparkles]

Are there no numbers anywhere on the other side of her?

Could it be a stud's brand or similar?