Any alcoholics in the crowd?

I have an AA question.

When you get your 'coin' for sobriety, what denominations are they? 6 months, 1 year, 2 years, etc?

And how are they given out? During the meeting? Quietly afterwards?

Asking for a friend …. :D For a fic, actually.

Thanks in advance. Clearly, anon comments are more than welcome!