Musical Instrument Accessories
Stork Studio Master Trumpet VMS4
Stork Studio Master Trumpet VMS4, Mouthpiece, For trumpet, Inner diameter: 16.18 mm, Total length: 8.41 cm, Backbore: Large, Bore: #27 (.144", 3.65 mm), Cup depth: Medium-shallow / V-shape, Rim: Standard, Silver-plated
https://www.bizrate.co.uk/musicalinstrumentaccessories/stork-studio-master-trumpet-vms4-oid1004879212.html