Steinway Model O pedals

[jamesaknight]

I've noticed the older European Steinway Model Os have just the two pedals.

Does anyone know when they started adding the sostenuto pedal?

[stringoverstrung]

There were certainly model O with 3 pedals in 1917.
It was probably optional and not standard.
Back then it was more popular in the US.

I think on larger Steinway`s it was more prevalent. I know of a Steinway B of 1906 with 3 pedals. So definitely already a while in the options list.

It is so that technically the Sostenuto pedal was improved later. For example on the 1906 Steinway you can move some keys by heavily pressing the sostenuto pedal which on today`s Steinway`s is not the case any longer.

[silverwoodpianos]

The sostenuto was first shown at the French Industrial Exposition of 1844 in Paris, by Boisselot & Fils, a Marseille company. French piano builders Alexandre François Debain and Claude Montal built sostenuto mechanisms in 1860 and 1862, respectively.

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