1865 New South Wales - Unwatermarked - Lithographed - One Penny - Stamp Duty Revenue - "400" cancel - Kangaloon.
 
"RR" Rarity rating, Hugh Freeman explains the rating system as follows in his excellent 2017 book, 'The Numeral Cancellations of New South Wales'.:

The ratings "reflect the numbers originally recorded in the five major collections surveyed in the 2000-2010 period, plus the new arrivals on the philatelic scene since publication of the 2012 edition. Again, it is important to understand that, whilst the ratings are a reflection of those quantities that may exist, they are not actual."

Under this system, RR represents "11 to 14 recorded".
 
 Hugh Freeman's rating system is as follows:

NNR = Number Not Recorded
RRRRR = 1 to 2 recorded
RRRR = 3 to 6 recorded
RRR = 7 to 10 recorded
RR = 11 to 14 recorded
R = 15 to 19 recorded
SS = 20 to 30 recorded
S = 31 to 49 recorded
Not Rated = 50 plus recorded

R = rare and S = scarce
 
Kangaloon /ˈkæŋɡəluːn/ is a locality in the Southern Highlands of New South Wales, Australia, in Wingecarribee Shire. At the 2016 census, Kangaloon had a population of 151.