Finnish civil defence helmet or civilian construction worker?

[Simonk]

I saw this fibreglass helmet today in a charity shop in Finland and was curious.

I think it's probably a civilian helmet but did wonder whether it's possible it could be some kind of civil defence helmet either wartime or later?

It's got a makers stamp of Karhula inside and on the brim crossed hammers, which would suggest construction worker rather that fire fighter or anything else, but not really sure.

What do you think?

[kradman]

I would say its a construction worker helmet ,most civil defence helmets i have seen have been the M17 SOHLBERG or WW1 FRENCH Adrian helmets