Yackey

Hai
Speed Holman used, probably one maybe two, yackey aeroplanes.These were modified Thomas-Morse S-4C biplane.
Holman used a dark painted one for wing walking etc.
There are pictures which showes such an aero plane with big advertising on wings and fuselage.
1. Did he used one or two of thse aero planes, or was it one but differend colors?
2. How and in which colors was it painted?
3. Who can help me with pictures taken during wing walking with this aeroplane?
4. Other pictures of both versions?
5. History and what is happende with the aero plane?
6. Other information/material?
Thanks
Jan