boosey and hawkes 921 round stamp sovereign cornet large bore On Ebay
https://www.ebay.co.uk/itm/boosey-and-hawkes-921-round-stamp-sovereign-cornet-large-bore/303378070095?
https://www.ebay.co.uk/itm/boosey-and-hawkes-921-round-stamp-sovereign-cornet-large-bore/303378070095?
