These are truly vintage reeds made for Boosey & Hawkes, London. They are graded simply as 'H' for hard.
Boosey & Hawkes Set Of 3 Valve Top, Outer Sprung Springs For Boosey & Hawkes/Besson Cornet/Tenor Horn
Schubert - Octet vintage Hawkes Pocket Scores - published Boosey & Hawkes
Boosey & Hawkes ‘Artia’ Excelsior old Cello for restoration
Boosey & Hawkes Regent II Trombone with Hard Case
Boosey & Hawkes (Imported by Lafeur & sons) Flute in case - Not tested
Ajax Snare Drum - Boosey & Hawkes - London - Made In England - Vintage