I knew I was missing a couple details! Ya always come in clutch when it comes to depot related questions.Barrel blank made by steel company Döhlen. Lot 45 year 1937. Barrel was then finished by erma. All gew98m barrels were armorers spares and are denoted by the 0,2 marking (all k98k spares will also have the 0'2 marking). Neat updated gew98!