CS-6OAK.
In a CS-6OAK M 6x66x666 M, there are six of the same number within the serial number and any of the CS-6OAK can be in any position, and cannot be grouped. There must be at least one of the identical digits separated from the other ones, M 66666x6 M or M 66x666x6 M.

CS-Sextup.
In a CS-Sextup, there are six numbers that are the same and are grouped together with no separations, M 666666xx M.

CS-Pair and a Sextup.
In a CS-Pair and a Sextup, there is a CS-Pair and a CS-Sextup, and the CS-Pair must be at position #1 or position # 7 M 22666666 M or M 66666622.

CS-Pair in a Sextup.
In a CS-Pair in a Sextup, there is a CS-Pair in a CS-6OAK. The CS-Pair must be grouped and within the CS-6OAK, M 62266666 M, these are also CS-Binaries. 450 7 $25 - $500

CS-Random Pair in a Sextup.
In a CS-Random Pair in a Sextup there is a CS-2OAK and a CS-6OAK M 26666266 M. This is also a CS-Binary.

Note: This page contains excerpts and basic information from the book "The Green Guide to Fancy Serial Numbers". Please consider adding a copy to your library, thank you.