This firm produced perfins from 1914 to 1954.
It produced more perfin covers on more stamps over a longer period of time than any other Cuban company. Here are some covers (and a custom declarations form!) produced in that time. Each cover is different in some respect from every other, yet they all have the same general information.
1920's customs declaration form with SA/RRA perfin stamps
Used 20 December, 1919 from Havana to Sherman, Texas
SA/RRA perfin on 2¢ Máximo Gómez definitive (1918) - Scott 266, Edifil 206a
Used July, 1921 from Havana to Paris, France
SA/RRA perfin on 5¢ Calixto García definitive (1917) - Scott 268, Edifil 208
Used 7 November 1927 from Havana to New York City
SA/RRA perfins on two 1¢ José Martí definitives (1925) - Scott 274, Edifil 214
Used - Time/date stamp on reverse: 25 February 1936
SA/RRA perfins on two 1¢ José Martí rotary press definitives (1930) - Scott 308, Edifil 251
Used 27 April 1938 to Europe
SA/RRA perfin on 5¢ Calixto García definitive (1930) - Scott 306, Edifil 245
Window envelope used 24 June 1936
SA/RRA perfin on 2¢ Matanzas free port commemorative (1936) - Scott 325, Edifil 279
Baronial envelope used 1936
SA/RRA perfins on two 1¢ Matanzas free port commemorative (1936) - Scott 324, Edifil 278
Used 1938
Perfin on 10¢ international airmail definitive (1931) - Scott C5, Edifil 256
SA/RRA perfin on 2¢ Máximo Gómez rotary press definitive (1934) - Scott 309, Edifil 252
Used 31 January 1942 – 3¢ franking by postage meter.
SA/RRA perfin on 1¢ Tuberculosis postal tax stamp (1941) - Scott RA4, Edifil 4
Used 29 September 1944 – 10¢ franking by postage meter.
SA/RRA perfin on ½¢ Victory postal tax stamp (1942) - Scott RA5, Edifil 5
Used 31 January 1951 to New York City – 2¢ franking by postage meter.
SA/RRA perfin on 1¢ tuberculosis postal tax stamp (1950) - Scott RA10, Edifil 10
Used 31 January 1951 – 2¢ franking by postage meter.
SA/RRA perfin on 1¢ tuberculosis postal tax stamp (1950) - Scott RA10, Edifil 10
Used 17 November 1954 – 13¢ registered franking by postage meter.
SA/RRA perfin on 1¢ Tuberculosis postal tax stamp (1954) - Scott RA25, Edifil 24
And here are some of the stamps which have SA / RRA perfins: