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This page contains information regarding Star Trek: Discovery, and thus may contain spoilers.

You may also be looking for Sarek's cruiser (2256).
Sareks Vulcan Cruiser

Sarek's ship approaches Discovery in 2257

Sarek's ship was a Vulcan cruiser owned by Sarek operating under a diplomatic registry number.

In 2257, Amanda Grayson took the ship to Starbase 5 to find out what had happened to Spock. After the doctors there refused to reveal any information, Amanda stole Spock's medical file and sought out the USS Discovery, approaching without identifying themselves and using a diplomatic frequency. (DIS: "Point of Light")