Please note that version 1.9.25 brought some visual changes to how Premium Incubators appear in the Market and in-game.

BEFORE 1.9

Before 1.9 This is what an Epic Incubator would appear like:
Before 1.9 This is what a Premium Incubator would appear like:

AFTER 1.9

After version 1.9.25 this is what an Epic Incubator would appear like:
After version 1.9.25 this is what a Premium Incubator would appear like:
After version 1.9.25 this is what a Unique Incubator would appear like: