Tone ring in Earl Scruggs Standard

I came across a Gibson Earl Scruggs Standard dated 10-2-93 on the sticker.  It is in bone-stock condition.  I understand that Greg Rich left Gibson earlier that year, so it is a post "Rich era" instrument.  It has a 20-hole tone ring in it which sounds fine to my ears.  I'm not looking to disassemble the banjo or trade out the ring.  I am just curious what type of tone ring it might be.  Would it be a Kulesh or some other make?  If it is a Kulesh, would it be a specific model?  Thanks for any input you might have.