Emivest SJ30 (N50SJ)

According to the FAA this is serial number 5. Wiki says only eight were ever built.

Now known as SyberJet. Claimed to be the world's fastest and longest-ranged bizjet. The SJ30 has a high speed cruise of Mach 0.83 (486 ktas), a range of 2,500 nm, and a sea level cabin to 41,000 ft. Holds three closed-course world speed records. To be built by Metalcraft Technologies of Cedar City, UT, which owns the type certificate.(https://en.wikipedia.org/wiki/SyberJet_SJ30)