Does the Sai Satcharitra mention if Baba's followers were only in India or if he had an international following?

Yes, the text explicitly indicates that Sai Baba's influence extended beyond the borders of India. In Chapter 36, the author writes, "Those in the country and abroad worship him; the flag of his devotion flutters." This statement confirms that his fame and the devotion he inspired were not confined to his immediate geographical location but had reached foreign lands as well. The chapter uses this point to illustrate the vastness of his glory and his role in calling out to and fulfilling the desires of all, including the poor and weak, regardless of where they were from.