I recently bought a Nova PRO-TEK Supernova2 companion Chuck. I was somewhat surprised that the Chuck Jaws (Not the Top Accessory Jaws) were not numbered like many others on the market. I queried this with the manufacturers as replacing the Jaws in the correct order after maintenance etc could be somewhat problematic without them. They replied that the numbers are underneath! I then checked a few pictures of the chuck online and some pictures clearly show numbered Jaws whilst others don’t. I don’t particularly want to take the chuck apart at this stage so I’ll have to take their word for it that the numbers are underneath somewhere.
I may report back sometime in the future to confirm/deny this in case it’s of help to others.
Attached are a couple of conflicting pictures Fron the net.