Question About 6 Month Chip

Last night Keven was at an AA meeting with his gf.  It was her regular meeting, his first time there.

At the end when they gave out chips, he went up for his 6 months, and they gave him a marble.  Just a regular old marble.  No explanation.  He asked a few people what that meant and no one knew.

Have any of you ever heard of this?  Can you think of why they would give him a marble and not a chip?

P.S.  Other people were getting chips, he was the only one to get a marble.  I am mostly just curious about this, never heard of it before and I've been around AA for 20 or more years (via friends).


Peace, Hope and Love,
Barbara