I'm contemplating pulling the trigger on a deal for what is being called a Blue/Yellow combo coticule, but I can't tell whether it really is, or if it is a yellow coticule backed with slate. How does one tell the difference from a picture? Note that these pictures are number coded (all #1s are the same coticule, all #2s are a different one...etc)
Coticule #1
Coticule #2
Coticule #3
Coticule #4
Coticule #4, Different View
Coticule #1
Coticule #2
Coticule #3
Coticule #4
Coticule #4, Different View