Mark above slot

No marks in top left corner

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

a

No marks in bottom corners

Small mark in top left corner

a

No mark in bottom left corner

No mark on bottom ridge

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

Mark above slot on left ridge

a

Marks above slot on right edge

a

Pip 5,5mm.