Need help on this old Rolex brevet ref 6484

[NickTrian]

Does anyone know anything about this specific watch?
I have looked everywhere and can't even find a single photo of it anywhere let alone info. It should be from the 50s. And has this reference on the case: rolex brevet 6484. I haven't been able to open it yet because I don't want to do any damage to it. It's in bad condition and it has and "elastic" rolex bracelet. Any information would help thanks for your time.