Hamburg Steinway sostenuto (-not)

[centipod at mac.com]

I'm rebuilding the action and restringing on a 1926 Hamburg Steinway  
O 170, and was surprised to find that it has no sostenuto mechanism,  
although it does have tabs on the damper levers (the old un-hinged  
kind). It's not just missing the mechanism - there are only two  
pedals. This is my first experience with an old Hamburg; I wondered  
if others with more experience with them (Europeans perhaps) can tell  
me whether this is typical, and when they started installing  
sostenutos.  Perhaps other models had the sostenuto in this era, and  
that's why these dampers have the tabs?

Sincerely,

Allen Wright, RPT




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