Japan in its' best.

"Japan in its' best" was written on the chopsticks' package. Why is there an ' after its ?

Is it a spelling mistake?

We don't put an ' in "He in his best" or "You in your best", why would we have it in the example above?

I think it's a typo, what do you think?

Thanks!

I don't think it's a typo, it's a misunderstanding or simply mistake (depending on how you look at it).

MrPedantic is right that it should be "at it's best", but in Japanese "in" and "at" are often translated from the same Japanese character.  I would say "in" is actually more poetic and real, grammatically "at" is better though.

The ' is there because they want to show possession.  However, we don't use ' with pronouns (his' book, hers', and its').  So, they have simply made a simple and common mistake often made by native speakers.

Now, that was a typo!!!!

"Government, even in its best state, is but a necessary evil; in its worst state, an intolerable one." - Thomas Paine

IN would indicate being a part of, AT is more like third person, the action is away from the speaker.  Use the verb LOOK, look in vs. look at.

For positive commenting, we use "[You] are at your best".  When the comment could be positive, but the speaker wants to associate something as unexpected, "[You] are in rare form."