Office Supplies mix of materials gold

Replacement nib for Waterman Hémisphère 2010 Black GT fountain pens.
A - Rounded tip - Suitable for beginners.
EF - Extra Fine (Extra Fine) - Very thin line.
F - Weak tip (Fine) - Suitable for normal writing and notes. Gentle pressure creates a fine line. Very popular, suitable for users with standard handwriting.
M - Medium tip (Medium) - Average pressure and line width. Suitable for users who like a slightly stronger line.
LH - Tip for left-handed (Left-handed) - Beveled tip.
OF - Beveled weak tip.
OB - Beveled strong tip

Replacement nib for Waterman pens of the Expert GT collection.
What does the spike marking mean?

A - Rounded tip - Suitable for beginners.
EF - Extra Fine (Extra Fine) - Very thin line.
F - Weak tip (Fine) - Suitable for normal writing and notes. Gentle pressure creates a fine line. Very popular, suitable for users with standard handwriting.
M - Medium tip (Medium) - Average pressure and line width. Suitable for users who like a slightly stronger line.
LH - Tip for left-handed (Left-handed) - Beveled tip.

Waterman Caréne GT replacement tip

What does the spike marking mean?

A - Rounded tip - Suitable for beginners.
EF - Extra Fine (Extra Fine) - Very thin line.
F - Weak tip (Fine) - Suitable for normal writing and notes. Gentle pressure creates a fine line. Very popular, suitable for users with standard handwriting.
M - Medium tip (Medium) - Average pressure and line width. Suitable for users who like a slightly stronger line.
LH - Tip for left-handed (Left-handed) - Beveled tip.
OF - Beveled weak tip.