Swedish Model 1921 / 18 "high dome" & M21 / 16 "low dome"

here is the Swedish M1921 /18 high dome helmet on the left and a Swedish M21 / 16 "low dome" on the right

notice the difference in the shape, one has a higher profile, and the other has a flatter more flared shape

The Swedish military M21-18 helmet was introduced in 1921 as the second version of the M21 helmet. The first version, the M21-16 had a wider brim. Swedish M21 (18), also known as the "high top" was the second type having a narrower brim and less of a crest, these helmets were developed in 1918 but did not come into production until 1922/23, made of quality materials at the Eskilstuna Factories they remained in service throughout WWII when they were then eventually phased out by the M37.