Left Thumb Keys

I · Low Octave Key
The high octave key is the thumb key that is closest to the mouthpiece.  The key is used as a vent for notes in the range D₅ to G₅ and E₆ to G₆.

II · High Octave Key
The low octave key is the middle thumb key, between the second octave key and the low Bb key.  The key is used as a vent for notes in the range G#₅ to D₆.

Bb · Low Bb Key
The low Bb key is the key farthest from the mouthpiece.  The key is used primarily for playing low Bb₃.

Left Hand Main Keys

1 · First (Index) Finger Key

2 · Second (Middle) Finger Key

3 · Third (Ring) Finger Key

Left Hand Little Finger (Pinky) Keys

G# · G# Key
The G# key is located closer to the mouthpiece than the low C# and low B keys and is used primarily for playing G#₄, G#_5, and Eb₆.

C# · Low C# Key
The low C# key is the outer key in this key stack and is used primarily for playing low C#₄.

B · Low B Key
The low B key is the inner key in this key stack and is used primarily for playing low B₃.

Right Thumb Keys

D · D Octave key
The D octave key is the only right hand thumb key and is used for playing D₅, Eb₅, and D₆.  On some models, this key is placed as a left thumb key instead of a right thumb key. 

Right Hand Main Keys

1 · First (Index) Finger Key

2 · Second (Middle) Finger Key

3 · Third (Ring) Finger Key

Right Hand Side Keys

D · D Side Key
The D side key is the side key just above the right hand main keys and is used to play third-octave D₆.

C · C Side Key
The C side key is the side key closest to the mouthpiece and is used as an alternate and trill fingering for first- and second-octave C.

Bb · Bb Side Key
The side Bb key is the side key farthest from the mouthpiece and is used for the basic and trill fingering for first- and second-octave Bb.

Right Hand Little Finger (Pinky) Keys

Eb · Low Eb Key
The low Eb key is the upper right hand little finger key and is used for playing first- and second-octave Eb. Some models include rollers for this key and the low C key for switching between the two keys.

C · Low C Key
The low C key is the lower right hand little finger key and is used primarily for playing low C.

Sarrusophone Fingerings

The numbers 1, 2, and 3 are used to represent main holes to be closed while a dash (-) is used to indicate a main hole to remain open.  Left thumb keys are shown first, followed by left hand main keys, a pipe (|) to separate hands, and finally right hand main keys.

II 123|1--
 -2-|D 1--

Side keys and little finger (pinky) keys are shown as superscripts in the left hand and subscripts in the right hand at the position the keys are located.

12-|_Bb---
123^C#|123_C

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Eb Contrabass Sarrusophone

Left Thumb

Left Hand

Right Thumb

Right Hand

Images courtesy of Grant Green's Contrabass Mania.