Just offering a thought here.
This man looks to be reasonably well of and possibly a professional or semi-professional worker.
His hands and nails are well cared for and he wears a fob watch. You can just see the bar through one of his vest's buttonholes.
The wearing of the watch was possibly a sign of status.
I know that when my g grandfather completed his university degree around 1906, the gift from his parents was the fob watch which I still have

Do you know your g. randfather's occupation?
Sue