Ibach Four
This is why the Oberdämpfer (top-dampener) mechanic is also called Birdcage Action – the hammers are really caged in by the dampener rods. My Ibach piano actually has a more advanced top dampener mechanic than other cheaper pianos from that time period, because Ibach and Blüthner used a better development of the concept. It still has much more sustain than modern pianos, but it sounds great nevertheless. I should probably use this series of photos for a proper article about the piano over on my “other” blog!