Takoradi Harbour Empire Marketing Board

I have 8 posters, showing progressive lithographic states of this Takoradi Harbour, Native Chiefs in Palaver poster. I am showing the black and white poster proof and also the most complete (before lettering). I would like to sell them as a run of 8. There is a poster for each colour.
Spencer Pryse did his own lithographic stones, so these would have been proof runs. It is very rare to find these. I do not have the complete poster with lettering but can direct you to one of my dealer colleagues.
Takoradi Harbour is in Western Ghana. The construction started in 1921 and was completed in 1928.