This picture features twice a flag with a dark border and a light inner: which flag is that?

From left to right we can see:
- an Italian flag
- a British flag
- a striped flag, possibly USA
- a tricolor flag, possibly French or Irish, doesn't matter
- the mystery flag
- a USA flag
- another USA flag
- a third USA flag
- again the mystery flag
The event has been described as "Douglas Fairbanks holding up Charlie Chaplin in front of crowd to promote Liberty Bonds, Lower Manhattan, NYC, 1918"
It looks similar to this one, but it doesn't include the central blue stripes:

I guess it might be something special related to the warbonds, then, does anyone have any info about those special flags?


