Finland Military Field Post
From Stamps of the World
Finlands Military FieldPost Mail is known as Kentta-posti. The Postal Service was provided by the Military not the Public Mail Offices.
Mail was normally provided free (or stamps supplied by the Military) or was kept at a rate of local mail, regardless of where the mail was being sent from-to.
Initially in 1941 each soldier was issued with 4 stamps per month
