Who is Damu Anna, and how is his story introduced in Chapter 25?

In Chapter 25, Damu Anna is introduced as a wealthy and well-to-do person from Ahmednagar who belonged to the Kasar (bronze-smith) community. Most importantly, he is identified as a great devotee who was deeply "devoted to Sai's feet." The author sets the stage for his narrative by promising that it is a story that clearly shows Sai's love for His devotees. The chapter suggests that even though the story itself is short, listening to it with reverence will fill the listener's heart with joy, help them understand how the Guru-Mother is an "Ocean of Mercy," and cause their own difficulties to vanish.