Orchestral & Wind Instruments
Warburton Top Part 2 MBC for Cornet
Warburton Top Part 2 MBC for Cornet, Top Part 2 MBC for Cornet, Medium British cornet top, Inner cup diameter: 17.25 mm, Outer cup diameter: 27.70 mm, Silver-plated, Developed especially for use in brass bands
https://www.bizrate.co.uk/orchestralinstruments/warburton-top-part-2-mbc-oid6156686880.html