A mid-20th-century American half-face respirator, identified by the U.S. Bureau of Mines approval number B.M. 2115 as being manufactured by Willson Products, Inc. of Reading, Pennsylvania. The unit is constructed with a black molded composite nose and mouth guard, edged with a wide, contoured tan rubberized fabric face seal designed for a secure fit. A rectangular metal filter canister is attached to the bottom, featuring a front plate with a perforated circular grid pattern. This canister is held in place by a wide, tan leather strap that wraps around the center of the facepiece. The head harness consists of a three-point adjustable system made of tan elasticized cotton webbing with metal sliding buckles. The metal base of the filter attachment is clearly stamped with the designation B.M. 2115. This type of respiratory protective equipment was commonly utilized by the U.S. Navy and in hazardous industrial sectors during the 1940s.