I recently found his obituary. [NB - I only found it because I had found his middle name elsewhere]
William Gaff Sanderson
b 8th June 1861, Polmont, Stirlingshire
d 19th June 1937, Falkirk, Stirlingshire
Debut – Saturday November 26th 1881 v Alexandra Athletic (H) Friendly
Competitive Debut – Saturday October 2st 1882 v Renton (H) Scottish Cup 3rd Rd
Positions – Centre-Forward
Scottish Cup Matches/Goals [1/1]
Other Matches/Goals [6/2]
Scottish 2nd XI Cup Matches/Goals [1/-]
Known Career – Falkirk [1880/81-1883/84]
William Gaff Sanderson
b 8th June 1861, Polmont, Stirlingshire
d 19th June 1937, Falkirk, Stirlingshire
Debut – Saturday November 26th 1881 v Alexandra Athletic (H) Friendly
Competitive Debut – Saturday October 2st 1882 v Renton (H) Scottish Cup 3rd Rd
Positions – Centre-Forward
Scottish Cup Matches/Goals [1/1]
Other Matches/Goals [6/2]
Scottish 2nd XI Cup Matches/Goals [1/-]
Known Career – Falkirk [1880/81-1883/84]