RD is most likely Ruiz Diaz. Ruiz Diaz Saddles - Talabarterķa Ruiz Diaz
Back in the day, saddles made in Argentina were not very high quality. Nowadays, it's India who makes the low budget leather. Argentina has stepped up slightly in the world of English tack.
Recently, the Ruiz Diaz factory has been producing Collegiate and Pessoa saddles (among others...Ovation I think). Pessoa uses French leather, but they can keep their prices low by using Argentine manpower.