Fountain Pen!? Sterling Marks

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.925 clearly seen mark. C reverse E mark similar to European CE. Unidentified nib marks. Star and 5 digit sequence.....may be 40510 (viewed under 10X loupe). Do fancy pens qualify as jewelry?

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Marks appear double struck...might be Italian maker 405 TO (for Torino).

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Maker 545 TO appears to have worked on a Borghini sterling ballpoint in 2012 ( from a commercial listed view).

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This has a list of several Italian registration numbers and the Pen maker brand associated with them: http://www.fountainpennetwork.com/forum ... d-italian/
Scroll down a few entries.