Mint- should be brand spanking new and never played with. Perfect cue with no imperfection in the build.
Excellent- level below mint. No dings and scratches but has swirls in the finish. I see a lot of close up pictures on the for sale section that has swirls. You can see it with the ebony cues.
Like New- played with. Slight wear from play but finish is still glossy.
Mint and new are not synonyms. Something could be new and not mint and something could be mint and not new.
First of all, new is not subjective. Mint is. There are not degrees of new. It is either new or it isn't. There are degrees of mint. There is mint and there is Gem mint.
Secondly, the definition of mint from wikipedia
"Mint condition is an expression used in the description of
pre-owned goods. Originally, the phrase related to the way collectors described the condition of coins. As the name given to a coin factory is a "mint", then mint condition is the condition a coin is in when it leaves the mint."
If mint is meant to imply free from defect then age of the cue is completely irrelevant. What someone does to the cue is irrelevant provided the usage created no damage.
A cue can be mint and not original
a cue can be all original and mint or not mint
a cue can be new and mint or not mint
a cue can be used and mint or not mint
alas, new and mint have nothing to do with one another except that most new cues are mint, but it is purely the lack of damage and usage that supports a mint cue.