This one has the Acton vent, introduced to improve tuning. A lovely B&H Symphony 1010 Bb clarinet serial no. 419113 made in about 1983. I bought this clarinet in 2011 and have been using it for orchestral and chamber music.
Excellent Boosey & Hawkes Symphony 1010 Clarinet in Bb
Boosey & Hawkes Symphony 1010 Clarinet with 2 Mouthpieces
Excellent Boosey & Hawkes Grenadilla Symphony 1010 Clarinet in Bb
Boosey and Hawkes Symphony 1010 Clarinet Barrel
Boosey & Hawkes Set Of 3 Valve Top, Outer Sprung Springs For Boosey & Hawkes/Besson Cornet/Tenor Horn
Boosey & Hawkes ‘Artia’ Excelsior old Cello for restoration
