Speculation on the sire of the Bahraini mare Nuhra

Al Khamsa has the following information on the Bahraini mare Nuhra (two photos above): A 1936 bay Kuhaylah Wadnah Khursaniyah mare bred by the Amiri Stud of Bahrain. By a Kuhaylan Jallabi by a Kuhaylan Jallabi, and out of a Kuhaylah Wadnah Khursaniyah by a ‘Ubayyan. NOTES: This information is referenced to the Amiri Stud Book of Bahrain and the Arab Horse Society stud book (Vol. VI, 1944, page 254). Nuhra was imported in 1939 to Englad as a gift from the ruler of Bahrain to the Earl of Athlone. I wonder who her sire was. We know from both Ahmed Mabrouk’s 1936 account and the from foundation stallion’s chart in the Amiri Studbook of Bahrain (below) that the sire of the first speckled Jallabi was a stallion of the Shawaf strain, so he could not be Nuhra’s sire. We know from the Amiri Studbook that the second speckled Jallabi (famous photo below) was born in 1930 or 1932, and that his sire was the first speckled Jallabi. Could he have been the sire of Nuhra? Could there have been another Jallabi stallion sired by a Jallabi stallion in Bahrain at that time?