A little fountain pen mystery is afoot. I somehow have an extra inner cap for a Platinum pen. All of my Platinum pens with that style of inner cap have theirs in place and intact. I don't recall any of the ones I bought coming with an extra, so I have no idea what it's from or what it goes to, but it's a 100% match for a Platinum inner slip and seal cap from the Preppy/Prefounte (and I think Plaisir) style pens.

It must be an extra, but from what?

Tip of a Platinum Preppy fountain pen with its cap on, laying on a desk next to a roughly conical-shaped bit of plastic which is standing up.  The conical plastic piece is identical to the inner cap visible through the clear plastic lid on the pen next to it.

Imported from Mastodon

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