...There was no BA GP in 1953...
I have found
1953 - 18 January - Argentine GP, Buenos Aires where the car could have competed if it had been re-engined (A6G or enlarged 4CL with the supercharger removed)
1 February - Gran Premio de la Ciudad de Buenos Aires
1954 - 17 January - Argentine GP, Buenos Aires - It's unlikely that it would have been entered that late
31 January - Gran Premio de la Ciudad de Buenos Aires
Starting with the least likely, was it the 1953 Argentine GP ?
and could the driver be Jorge Daponte, who is listed as running in the 1954 GP but not 1953