From the most practical standpoint, it would seem that the major issue is how well the piano will serve you now. Touring artists often have significant action changes made to the piano before their concerts--voicing, for example. So if, for instance, you were to contact an artist who played it (should he even recall the event), the action regulation could be quite different now, making his observations of that event irrelevant. Or if Steinway NY were to tell you that they found time, and it turns out that Team B did the "belly work" and T. Jones did the chip tunings, and that the bridges were initialed by Dunston Clarke, that kind of information might not be all that informative or helpful to you.
If you have not already done so, I would instead recommend that you get an excellent tuner/technician to go over the whole instrument in detail, assessing any issues and needed corrective actions, and discussing his suggestions with you. Those meaningful adjustments could bring the Model D up to a whole new level of performance giving you even more satisfaction in owning and playing it. Knowing some history might be interesting, but addressing the here and now might be more beneficial.
I hope that D brings you many years of pleasure!
Thank for your response. Prior to my purchase of the piano, I had a Steinway certified technician go over the piano thoroughly and learned that the action needed some work and also voicing was necessary. With that knowledge, I purchased the piano knowing that there was work to be completed but also there was nothing irreversibly damaged.
I have had that work done. In addition, I seem to find more items that require service. However, the more that I play it, the better it gets.
I contacted Steinway in New York and was told by a Representative there simply that he did not have time to help me... not even obtain the records of who did the construction work on the piano. I do know that the piano was probably based in the Philadelphia area and have a partial listing of performers who played the piano. How do I contact them and how do you know if any would remember playing it?
For the past 30 years (since the late 1970s), I have been playing a Steinway Model M which I still have in my home. I am finding that the Model D has a much richer sound. I am an amateur who has been playing the piano since the 1950s when I was a young boy. I play the piano at least an hour a day and more when I have a day off. I had training in the 70s and 80s by a teacher who was trained in London by T. Matthay.
Rachmaninoff is much better on the D as compared to the M.