Large mark along bottom edge near left corner

Mark above slot

Mark in three corners (top left, top right, bottom left)

a

No mark above slot

No marks in top left corner

Mark in bottom left corner

a

Mark in bottom left corner

a

Weak mark in top left corner - no mark in top right corner

a

Double-mark in top left corner

a

Mark in bottom left corner + double mark in bottom right corner (when pip is bottom right)

a

Small mark + larger strong mark in top left corner

c

Mark in top left + top right corner

b

No mark near center on bottom ridge

No mark on bottom ridge

Small marks between stud 1 and 3, and between 2 and 4

Mark in top right corner

a

Mark in bottom left corner

a

Mark above slot on left ridge

a

Double mark left of center of bottom ridge

a

Line at 10-o'clock of stud 4

Small mark on bottom ridge right of center

a

Small marks between stud 1 and 3, and between 2 and 4

Marks above slot on right edge

a

Double mark in bottom right corner

a

No mark between stud 2 and 6

No marks between studs 2, 3, 6 and 7

No mark between studs 2, 3, 6 and 7

No mark near left corner on top ridge

a

Mark between stud 2 and 6

a

Mark between stud 2 and 6

a

Three marks between stud 2, 3, 6 and 7

a

Mark between studs 2, 3, 6 and 7