AM-1100 Cathedral

The AM-1100 has achieved what many thought to be no longer physically possible; what petosa considers to be the art of perfection. The AM-1100 belongs to a class of its own, setting the standard by which all other accordions are compared. Uniquely and individually handcrafted from the highest quality materials through four generations of craftsmen, no accordion is as powerful in sound nor will endure the test of time like an AM-1100. The Cathedral model has an extended keyboard range with the addition of a fifth set of treble reeds. Inspired by the classical sounding Church Organ, the optional fifth set is a unique Quint reed. Alternatively, a third middle reed is optional to blend Musette and Concert tuning in a single instrument.    

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Solid-core Mahogany Box construction. Double Tone Chamber (LM) handmade from one-piece solid aged mahogany. petosa 100% handmade Walnut keyboard/guides with Lucite key tops. Special dense felt and leather valve pads. Mahogany reed blocks featuring cedar chambers and newly designed air cavity optimization. Hand cut genuine calfskin reed valve leather. Exclusive petosa designed mahogany bass board and cover plate. All chromed silent petosa bass mechanics.
Available in 45 and 47 Keys
120 Bass Buttons: Low A
5 Treble / 5 Bass : Voci Armoniche BLUESTAR / all leather valves / A440Hz
II Cassotto, one-piece solid mahogany
15+Master Treble / 7 Bass
29 lbs (13kg)
10 Year Warranty / Lifetime Reed Guarantee / Lifetime Maintenance Included

Video Demonstrations

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206 632 2700


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