37×1

The notation "37×1" typically refers to a specific type of artillery ammunition. In this context, the "37" likely indicates the caliber of the projectile in millimeters, meaning it is a 37mm round. The "×1" generally signifies the length of the cartridge case, often expressed in inches or sometimes in a standardized designator. Therefore, "37×1" describes a 37mm projectile housed in a cartridge case with a length designated as "1".

Ammunition of this type was historically used in various anti-aircraft guns and some small caliber cannons. The 37mm caliber was a popular choice for such weapons during the mid-20th century due to its balance of projectile size, rate of fire, and effectiveness against aircraft and light ground targets. The specific cartridge case length, indicated by the "×1," would determine the propellant capacity and, consequently, the muzzle velocity and range of the round. Different case lengths were often developed for weapons firing the same caliber projectile to optimize performance for specific roles or platforms. The exact historical context and specific weapon system associated with "37×1" ammunition would require further identification of the manufacturer or military designation.