My mother has come across a P. Sigal pencil drawing and I have been doing some research on him and the area of his works, in Old San Juan, Puerto Rico. My mother has a print of "Calle Cristo" as far as I have learned "Calle Cristo" is a street. I have also read the other inquiries and have more information on the origin of at least a few of these works. But as for any information on the artist himself, I ran into a dead-end. It just seems like the person doesn't exist.
But here is what I could find on the location and a little history behind it:
Capilla de Cristo, the Chapel of Christ, was built as a memorial to a celebrated miracle. In 1753, a youth participating in a horserace at the St. John's Day festival lost control of his horse and plunged over a precipice. Don Mateo Pratts, a secretary of the city, prayed to Christ to spare the boy's life and the youth was saved. To express his gratitude, the young man had the chapel erected later that same year. Today, the chapel, located on Calle Cristo near Paseo de la Princesa, is a landmark and its Campeche paintings and gold and silver altar are highlights. Admission is free. The chapel is open for a very limited amount of hours each week.