2 Digit Radar & Possible Inverted

to the CCF!

This is a very nice and desirable banknote but it only qualifies as a two digit radar,
Your correct that this serial number only occurs once within each prefix but that is correct for every serial number as they are numbered consecutively from 1 to 9,999,999.
I'm assuming when you ask if it's also an inverted you mean is it a rotator note or as some American's call it a swims note. Rotator or swims notes must read the same upside down as when right side up.
So your serial number 6699966 when inverted reads 9966699 and is not a rotator note.
It could be claimed that it's a five digit cycle repeater (66999-66) but most collectors will only collect repeaters up to the four digit cycle.

Cheers, Bill

Very nice 2 digit radar @4Mango4 !