I plated the stamp below to 75R1E based on the narrow left margin and the fact that 5th column is slightly higher than the 4th. In addition, the guide dot on the stamp above (just barely visible) matches that of 65R1E. There are also some diagonal scratches in the RLC which may be what Neinken was referring to in his drawing.
Neinken considered 75R1E to be one of the best Type IIIa examples on the plate. It produced clear breaks in the top frameline even in very early printings.