Part of a music engraving tool set used mostly by Gordon Baker who worked for a. Kynoch & Co. Pty. Ltd. in Melbourne from the 1930s to the 1980s. Gordon Baker was apprentice to his father Jack. At the time, Gordon was the only music engraver working in Australia.
The leather punch bag was used to rest a pewter plate while the engraver turned it in order to engrave curves, either for text or music. The plate was taken off the litographic stone (sandstone) to do this
Roughly circular bulbous brown pad, single stiching along edge.