Munshi Zafar Ahmad was born 1862, died 20-8-1941 (See Dard, page 397).  He joined Ahmadiyya very early on in 1891, he seems to have accompanied MGA on many preaching tours.  He was listed as #9 in the famous list of 313 Ahmadis in 1896.

Plague had broken out amongst the Aryas of Qadian (1907)
Ahmadiyya sources report that plague had broken out in Qadian and Munshi Zafar Ahmad seems to have visited the editor of a magazine from Qadian entitled, Shubh Chantak.

He relates a story of MGA have a sever itch in the 1891-1892 era
See Tadhkirah, 2009 edition, page 1076 and Seeratul Mahdi by Mirza Bashir Ahmad.