Talking of strike lines (talking of the wolf, as they say in France), here are 2 more Steinway strike lines – adjusted from the dead straight to the alive curved – simply for the sake of sound…

This one is on a 1980 model B (with new shanks, too)

And this one is on a 1894 proto-A model:

(the piece of card is to offer a straight line comparison –  so you see that the curve is subtle but significant….)