Dedication Plaque USS EXCALIBUR
Below is the dedication plaque for EXCALIBUR.
Dedication Plaque USS GUINEVERE
Below is the official dedication plaque for the Captain's Yatch. The name Geunevere comes from the King's Arthur mithology. Guinevere was the legendary queen consort of King Arthur.
Below is a rendering of a commemorative patch for USS EXCALIBUR.
Below is another patch, this one the commemorative patch for the CIRCE-class Development Team at Star Fleet Engineering.