The other difference involves the font type and % vol indication at the bottom of the label. The picture on the right clearly shows the use of a different font type on the label of the same Sestante. The same holds for the 75 cl text (not visible). Also notice that the 'vol' text is absent on the left bottle.
The following questions can be raised: Is one of them fake or was it just sloppiness of the bottles at the time? And, if one of them is fake, which one is it? But why would someone make a nice job in copying the bird picture and mess up with the font type of the text below it?
If you know the answers, please let me know.