Hi,  I highly recommend Renner Premium Blue hammers for the 6'2" Mason &
Hamlin.  They are supposed to be the closest in tone to the originals.
They were also highly recommended by Art Reblitz.

We have them installed on our 7' Mason & Hamlin Ampico and they are
absolutely _wonderful_ -- have had many compliments on the tone of this
piano.

Bill & Dee Kavouras