I have 2 Swedish helmets.
I just got the M26 because I liked the look of it.
I tend to be fond of silly looking things, just ask my wife.....
My m26 is size 72 which is a great size for my head, althouigh there is way too much horse hair in the padding.
Makes for a very tight fit.
My other one is a wee bit too small.
Actually your other one is a Swiss M18/40, as it has the open-ring M40 liner and the original green paint underneath, it was made between 1940 and 1943.
.: World War Helmets - Casque Modèle 18/40 :.
Danger, very nice example of the Swedish M-26 which look's to be in a very similar condition as mine.
The Swiss M18/40 is very nice too, I particularly like the condition of this example