Couldn't help but notice that the image above is reversed. Look at the number '3' numeral. It's back to front! The venturi tube reinforces this, as this too was only placed on that side of the fuselage.
I suppose the star would still have appeared on both sides?
Not so, as they always faced forward (as does most unit insignia). This could explain why it's not immediately apparent. Not even the person who signed the print noticed, unless he kept quiet about it (or didn't care!).