Not enough information to get him
1878 Born Lancs (only year given)
1921 May 2. Joined with RIC no 80863 & ADRIC no 998 (963). ex-Soldier & Telephonist
1921 Oct 15. Posted to 4 Gds from Gormanston
There is a John Halstead Hargreaves born 1873 in Burnley. He has a Service Record for Boer War . But there are numerous John Henry Hargreaves born in the time period that is likely