502 xxx Tikky special marble turquoise 0.5 mechanical pencil
Year: 1992

Tikky special marble 0.5mm fine-lead mechanical pencil

Legendary marble tikky special mechanical pencil
Without red ring.
Natural - meaning without "Tikky special + size" writing

Models produced after 1989. were stamped with "Rotring" and "Germany"

Plastic design, with fixed sleeve.
for 0.5 mm leads

Unfortunately any production information about this hasn't been found.
They were produced somewhere in early 90s.

Seen in sets of 3 and 4 - natural and with writing
Also marble versions have been seen in blue, turquoise, rainbow, pink versions.
Separate article numbers haven't been discovered yet.

Usual nib distinction with lines as follows:
0.35 1 line
0.5 0 lines
0.7 2 lines
1.0 3 lines

Also different inside mechanism plastic:
0.35 red
0.5 black
0.7 blue
1.0 transparent

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