Cjd - I would like to see what you have found.
Meanwhile, I will share a few more Foochow cancels from my collection...
21 mm Circular Date Stamp
FOOCHOW around the top, 2.5 mm letters
Index A, 5 mm from the top
FOOCHOW with round O's
Earliest known date on QV stamps 6 January 1900
Latest known date on QV stamps 19 April 1904
Earliest known date on KE VII stamps 14 September 1903
Latest known date on KE VII stamps 12 December 1904
Source F.W. Webb - page 270
Notice my KE VII stamp on the right has a date of 17 October 1905, which is later than stated in Webb. Possibly Type F, but did they make Type F with Index A? Webb only says Type F with Index C. Not sure on that one.