State schools in victoria were issued with  maps of victoria like yours, ive seen a few with timber ends (made of two pieces with the map-end sandwiched in between, or one piece slotted for the map) .. they hung over blackboards and could be rolled up, or merely hung from the wall. one of the local schools has a number of them, one in particular stands out as it has Australian flora and fauna included as well. the school have ones from the fifties and sixties also, so they were used for a very long time with just materials changing . another i know of hangs in a friends house..it is over a metre in height and almost two across, and is extensive in its detail.. it has "Railways Of Victoria'' in bold across the bottom. i'm of the opinion they were commissioned by state governments for schools, railway stations and other departments.