Bass trombone in G, low pitch. Betty model, model number A57. Brass with silver plating. Single rotary valve introduces tubing to lower pitch by a perfect fourth (to D). Large ten inch bell diameter. Outer slide brace is fitted with a rosewood handle. Ferrules embossed with floral patterns. Mouthpiece missing. Stamp on bell reads: Boosey & Hawkes Ltd/HAWKES LONDON/141021
The G bass trombone lacks the lowest notes available to the earlier F bass trombones. Adding a thumb valve not only extends the range but also increases agility by reducing slide movement. This was the first G+D trombone made by Boosey & Hawkes. These instruments were called Betty Model in the company's books after noted orchestral trombonist William Betty. G+D trombones were produced until the 1970s, but in the later years of production were only played in brass bands before they, like orchestras, changed to the wide bore B flat+F bass trombone. Transcription of workshop order book: 'Date given out: 29th June 1932; Date received: 1st July 1932; No. of instrument: 141021; Description: J. Trombone F.P. cylinder to D; Model: A57; Charged to Regent Street: 21st July 1932; Polisher: L. Paul 19th July 1932; Grinder: Bartlett 20th July 1932; Maker: Scott - 1.5 hours at 1s.9.5d, total 2s.8d.; Downing - 11.75 hours at 1s.7.5d, total 19s.1d.; Marten - 12.5 hours at 1s.7.5d; Marten - 12.5 hours at 1s 7.5d, total £1 4d; Ovendy - 9 hours at 1s.7.5d., total 14s.8d.'