Riflemen with m/23 uniforms and m/23 hats. The m/23 hat was the official hat from 1923 until 1937, but it was still used during ww2. It had the same colour as the uniform.
The m/23 hat was very similar to the m/ä och m/26 hats. The m/ä (model older) hat was dark blue and was the offical hat from the 19th century to 1910 when it was replaced by the m/10 hat. The m/26 hat was used by the Landstormen (home guard militia) and was grey.