Thank you, RosalieR- Your observations are very correct, congratulations!
Yes, as I was saying, the joints of the Masters are generally cleaner, more defined, indeed, also regarding the filaments I agree with you.
As for bubbles, many whisplers have an exaggerated amount (although it is not a rule) of bubbles of all sizes, large, small, and medium, enclosed in a single marble,...something that is very difficult or even impossible to notice in a Master.
Yes, your three are 100% whisperers, the first one is crazy! It's one of those rare clean ones, with very few or no bubbles and a nice green glass. What size is it?