I've been told this is for the original Mini  - it has the number 12G103 on one edge although it is difficult to read & has DD8A above (see photo). There is no manufacturers name on it. 

I understand it will also fit some other Austin, Morris, Rover cars BUT I'm not an expert so please make sure it is suitable for your car before you purchase.  

It came from a dry garage where it had been stored for some 45 years.