As one leaves Dongguan's courtyard they are met by this large Arabic installment. Although I remain unsure of its author, we can ascertain its completion date- from DSCN0942. This fits with the founding dates on many of Xining's other mosques, all of which fall roughly. This sign gives one of the earliest dates I have seen on a mosque, leading me to believe that perhaps Dongguan led the way for a revival of Islam in Xining in the past decade.