I have no additional information on this William Galt, 1873-1943.
My William Galt:
William James Galt
b. 4 Jan 1881, Philadelphia
m. Gertrude Reuther about 1910
one child: Charles H Galt, b. abt 1912
I have found another candidate for this Wm Galt on the PA Death Indices that died in 1956.
I have ordered the death certificate. It should arrive in another 4 months.