FlyXwire
Woolley's 'The Hat in the Ring Gang' is probably the best source for 94th Aero SPAD pics, but very few show the top wing numbers.
Most of the pics of the 94th show a dark number with a darker highlight, which is yellow with red highlight. Not sure where I found this pic of the original fabric from A/C #22.
94th-22.jpg
There seem to be a few anomalies in markings;
Rickenbacker's SPAD had white numbers with a red outline on fuselage and wing.
The pic on p.134 seems to show a dark number with white border or highlight??
The only other shots I could find of a top wing number are:
SPAD no. '6' on p.203 which shows a dark number - yellow with dark border - red on fus. and wing.
A clearer version of no. '16' on p.130 is in C & C (US) V.3 #1 - it shows a dark number on the top left wing.
SPAD no. '9' on p.194 shows a dark number on the top left wing.
Cliff