Welcome to the hobby! Don't take my feedback the wrong way but I would say your serial number is simply a 2 digit SN & not special (or “fancy” as US collectors call them). It may be eye-catching to some but most would pass due to its condition.
Special serial numbers must have a set pattern:
A repeater would be 67676767 (2 digit repeater) or follow an XYXYXYXY pattern. There are also 3 digit & 4 digit repeaters but these bring less premium (like or ABCABCA & ABCDABCD or 67546754)
A radar is often more sought after:
6766676 is a 2 digit radar but you could also have a 3 digit radar such as 6788876 (for a 7 digit serial). Generally speaking the higher the # of digits the tougher & more of a premium. A 1 digit radar is the most sought after, called a solid radar, such as 6666666.
But, unlike collecting regular banknotes, the majority of special serial number collectors collect only UNC notes. So circulated special serial numbers take a serious hit in the # of collectors who will pay a premium for a circulated example. This also applies to Low serial numbers, ladders (1234567) & other special numbers.
Hope that helps!
