Welcome to the club. I'm a new member as well, enjoy. What do you collect?

here is the rating scale:

RARITY SCALE KNOWN SURVIVORS
UNKNOWN 0
UNIQUE 1
R-10 IMPOSSIBLE 2-3
R-9 EXCEEDINGLY RARE 4-7
R-8 EXTREMELY RARE 8-15
R-7 VERY RARE 16-30
R-6 RARE 31-75
R-5 VERY SCARCE 76-150
R-4 SCARCE 151-350
R-3 FAIRLY COMMON 351-750
R-2 COMMON 751-2000
R-1 EXTREMELY COMMON 2000+