The sale catalogue, p. 42, notes that the date for these two detached leaves comes from the colophon of this ms., which also names the calligrapher as Muhyi. The catalogue unfortunately is rather misleading, apparently associating production of the ms. with Bahram Mirza (d. 1549, brother of Tahmasp), instead of - presumably - Bahram's son, Sultan Ibrahim Mirza, who furthermore at this date (973 A.H.) was not recalled to Qazvin, but was restored to his governorship in Mashhad after a period of exile in Qa'in. This suggests that the ms. was produced in Khurasan; Ibrahim Mirza was comfortably the most significant patron of the arts at this time, being responsible also for the magnificent Freer Jami (see Shreve Simpson, Sultan Ibrahim Mirza's Haft Awrang), esp. pp. 231-2.
Other leaves from the same ms. were sold at Sotheby's on 14 October 1999, lot 44; 2 April 2004, lot 37, and 5 April 2006, lots 43-44.
The folios were not examined in person, the data available so far relying on the catalogue.