As I told you days ago, I just get an Steinweg Nachf Gran Piano (6,3) from aprox 1910. According with twao different techs the piano is in very good generals conditions but as any old piano will need some reaconditioning. Finally, aftere discuss with the tech we agree to make the following works: Change hammers (new ones for US$ 500 (plus US$ 480 for the manwork) , change one pair of string, total adjustment of the mech and cleaning + tunnig. I will pay in total some 2K. After the work, Do I need to do something special because the change of hammers? How could I confirm the quality of the work? Please advice. Is my first piano!

You should post this in the Piano Forum, and/or in the Tuner Tech forum. You will get more responses there.

You are right, sorry, was a mistake!

It will be interesting to read the comments on this post.

The instrument in question sounds like it's the precursor to the modern Grotrian-Steinweg. Properly refurbished, this could be a glorious instrument.

My guess is that if the strings are original, you'd want to have them changed out as well.

If you share with us your general location, we might be able to point you in the direction of a rebuilder who could be up to the task at hand.

Thank you John. Is true, if you remember the history of Steinweg v/s Stenway you will remember that when Theodor Steinweg (the only Heinrich Steinweg's Son that stayed in Germany after 1850 or something, you will know that he continue making Steinweg pianos since 1850 to 1865 when he moved to America to work in Steinway with the rest of the family. Then, he sold the company to his employees, betwen them, Mr. Grotrian. During the first years after that, they continuing making pianos under the trade mark Steinweg Nachf. In the first years of C XX, they started selling pianos to America and competiting with Steinway. The family start a law process again steinweg in order to avoid this. A son of Mr. Steinway went to Germany and they make an arrangment, since this date they start using the trade mark Grotrian-Steinweg. In the decade of 1960 Grotrian tried to register tyhe trade mark Steinweg in America, and Steinway stop then with a new law proccess, so Grotrian start selling pianos in America under the unique bran name "Grotrian". According with my information, currently they don`t use the trade mark Stenweg in any piano. So, yes, An Steinweg Nachf from 1900 is a Grotrian-Steinweg.

Than you for your interest. As you know, I know something about the history of my piano, but I am very ignorant in technicall matters.