The handwritten note on the back of the photo says:
Salesmen of Wallace Elliott & Co.,
on trip to Hudson Mass.
Thomas T. Matthews
I assume the arrow written in pen on the front of the photo indicates which of the salesmen in the photo was Thomas. He was my great-grandfather, born 31 Aug 1868 in Cookstown, County Tyrone, Northern Ireland; died 01 Aug 1954 in Emmaus, Lehigh County, Pennsylvania.