The merchant from whom I bought this old African photo could not identify the man but clearly the photograph had been taken a long time ago and was not preserved under the best conditions so the photograph is somewhat deteriorated. 

The overall dimensions are 18 3/8 x 14 3/8" (47 x 36.5 cm) The photo itself is 15 1/8 x 11 1/4" (38 x 29 cm)