xxxx Blue triangle ballpoint
Year: 1970s

This strange ballpoint pen is stil a mystery to me.

Old rotring logo and old older looking style fill put it somewhere in the 70s.
I am not sure is this rotring produced pen or it just has rotring as an advertising on it.
Rotring logo is printed on all three sides of the pen...the section is triangle based with round corners.

Also has this strange back side with transparent part glued in.
Only thing it comes to mind that it could have had some kind of lamp there.
But there is no sign of it or possibility to open.

If anyone has info about this one...would be great. Let us know.

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