Hey y'all,
Happened across this Vatican pen that was up for sale. I'm not sure what the make is and was pretty unsuccessful with a Google search. So far I found the following: the inscription is in latin and roughly translated says "he/she signs everyone his due" or "law gives everyone his due". This quote is one out of four other inscriptions on the ceiling of the Stanza della Segnatura (and a quartet of medallions). The "stanza" is part of four Raphael rooms in the public part of apartments in the Palace of the Vatican.

Hoping the folks here can help! Thanks in advance

Images here: https://imgur.com/gallery/6ExYSHI