Burroughs

Burroughs were one of the original manufacturers of Nixie tubes. In fact ‘Nixie’ is a trademark of Burroughs Corp. They bought the company that actually started manufacture of Nixie tubes – Baydu Brothers. Though there are earlier mass-produced cold-cathode numeric display devices made by National Union.

122P224

The 122P224 Nixie tube (or B5092A) was made by Burroughs of the United States, so this is a genuine branded Nixie tube. This tube is special because it has Krypton 85 added, which is a radioactive isotope of Krypton that emits alpha particles. These keep the Neon ionized and so help reduce the time it takes the tube to 'ignite', especially in dark conditions.

B54370A

The B54370A seems to be a variation of the B5441A - it has a comma in place of one of the decimal points, probably for use in displaying thousands.