Here's a bookmark from a Roman book bindery (and gift shop). This was from the days when folks would buy books in "original wrappers", then go have them bound according to taste and/or budget. It would also likely have served the needs of the Gregorian in binding dissertations and such. I'm fairly certain this shop no longer exists. If you're in Rome, let me know if there's any sign of it remaining -- on the corner of Via della Dataria and Via dei Lucchesi, just up from the Gregorian.