There are thus, two variations of each stamp.
There's a small difference in colour between the two issues, but for some of the stamps, it's very difficult to see.
The best way to see the difference, is when the border of the stamp is still attached.
|Romania, zodiac signs set 1 - single stamps|
|Romania, zodiac signs set 2 - single stamps|
The single stamps don't have the gold print above or beneath the stamps.
In stead of that, you'll see "ZODIAC (I) or (II)