The Kelvin Type KB 215/07 is a vintage British aviation instrument manufactured around 1948 by Kelvin, Bottomley & Baird Ltd (which merged with Henry Hughes & Son Ltd in 1947 to form Kelvin & Hughes Ltd).

Instruments starting with the "KB" prefix generally signify the legendary Scottish firm Kelvin, Bottomley & Baird (K.B.B.). Around 1948—the immediate post-WWII era—the company supplied a wide array of dashboard indicators for both military RAF aircraft and early British commercial airliners.

Depending on the specific subclass of the 215 series, this component is typically an altimeter or a pressure gauge/indicator (such as a boost pressure or fuel/oil pressure indicator).
Whereas this is a speed indicator.

During this era, British aircraft design heavily relied on these mechanical or pitot-static gauge variants.
Originally founded on the patents of William Thomson (Lord Kelvin), the company was a dominant force in maritime and aviation navigation.

This Era (circa 1948): This period marked a transition point. Instruments manufactured under the KB design specification were being integrated into iconic post-war aircraft such as the de Havilland Vampire, Gloster Meteor, Avro Shackleton, or early civilian models like the Vickers Viscount.

Like most instruments from this time frame, it features a heavy black metal casing, a matte black dial face with high-contrast white or radium-luminescent markings, and a standardized bezel meant for standard instrument panels.