There is plenty graders look at. Which may be confusing. Hope this helps....
(except Muskrats - see further down)
IPTII Fully prime, above average in quality, texture and pelt preparation. No defects.
I & II Prime pelt of above average quality and texture.
Good II Slightly early pelt with well finished guard hair but lacking underfur.
II Early or late pelt with incomplete guard hair and lacking underfur.
III Very early or late pelt with poor finish, little or no underfur, dark coloured leather.
IV & V Inferior pelt of little or no commercial value.
Good Slight (GD SLT) Good quality with small imperfections.
Slight damaged (SLT DGD) Average quality with small imperfections.
Good damaged (GD DGD) Good quality with large imperfections.
Regular damaged (REG DGD) Average quality with large imperfections.
Badly damaged (BDLY DGD) Extensive damage, little or no value.
Tainted Area of pelt has rotted, little or no value.
Largest size, Jumbo 0
Extra, extra large 1
Extra large 2
Large medium 4
Extra small 7
GD: Good ORD: Ordinary
SLT: Slight DGD: Damaged
BDLY: Badly PT: Part
RBD: Rubbed STND: Stained
GRSY: Greasy HVY: Heavy
S: Singed SH: Straight Hair
LT: Light ASST: Assorted
RR: Red Rim DK: Dark
BR: Brown T/S: Ticks and Scars
Heavy prime, very dense underfur, shearable long nap length, deep underfur long nap, deep underfur deep, thick underfur
Semi dense underfur, suitable for short shear medium nap length, medium underfur medium nap length, medium underfur medium density or underfur
Light or Flat lacks underfur, not recommended for shearing coat, short nap short nap, low underfur low density or underfur
A denotes the most desirable colour through D, least desirable,
except beaver where D denotes pale.
X preceding a letter indicates Extra ie. X-A=Extra Dark, X-D=Extra Pale
Some additional descriptive terminology may be used to denote unusual colouration.
Western (XXPale to ORD)
A - D Colour of Back
1 - 4
Colour of belly
1 - 3
A clear, very dark, natural colour XXPALE: double extra pale bright, silvery, clear underfur extra pale 1: clear, white belly deep, dark rich red clear, very dark bright white belly XPALE: extra pale 1: clear
B dark, slightly brownish XPALE: extra pale slightly yellow or brownish pale 2: slight off belly medium dark red dark, dark brown narrower belly, slightly brownish PALE 2: slight off/casty underfur
C brown to red over all PALE yellow to brown yellowish cast 3: off belly pale red brown narrow belly, noticeable brown red band LT BRN: Light brown 3: off/
D ORD: ordinary/ reddish brown dark yellow to brown or orange tawney 4: very off (brown) belly very pale to yellow pale very narrow or red belly BRN: brown
XD extra pale DK: Dark
Heavy (HVY) Thick underfur and guard hair, heavy leather
Semi Thick underfur and guard hair, semi heavy leather
Fall Dry leather, poor fur quality
Light Light leather
Papery Ordinary quality
Kitts & Mice Immature muskrat, underdeveloped guard hair and extremely light leather.
Shedders Past prime, losing hair on kidney area
Damages Varying degrees of damage from slight through bad damaged