This firm produced perfins from 1917 to 1949.
Ricardo Veloso Guerra founded Libreria Cervantes in 1910. In 1925, he applied to the post office officials to obtain permission to perforate postage stamps. He attached a sheet of paper that was perforated by his 10 die machine and had 3 perfin stamps affixed. He got an affirmative response the next day. Here are those documents:
The letter of acceptance refers to the Decree of 1920 pertaining to the use of perfins on stamps. It reads:
Decree No. 321 of January 1, 1920, authorizing the use of perfins on Cuban stamps:
"Article 65. The public can mark stamps with distinctive perforations without the loss of their postal validity, provided that the perforations conform to the following rules:
Stamps marked with distinctive perforations that do not conform to the above rules shall be void."