Help Identify These 3 Stamps

Good day to all. Can anyone please provide me information about these 3 mint stamps perforated with gum on the back? They are 10 red, 25 yellow brown, and 50 blue. Any information would be helpful. Thank you in advance.

Pohjois is a section of Helsinki, Finland. That is as much as I know!

Peter

Thank you Peter..gave me a hint to look through the Scandinavia countries..did not see anything under the main book with Finland about these specific stamps. If anyone knows about these stamps and scott # would appreciate it.... Don't even know what there value may beof them. I got them with a mix lot of World Stamps recently.
I am going to check other sites to see if they are in any of them too.

look at North Ingermanland, SC#1-7 (you have SC#2-4)

Man this forum is fast! Kuhli beat me by 6 minutes.

Blazenstar, you can find these in www.stampworld.com and they are three of the first stamps of North Ingermanland.
They sell for less than $5.00 each.

Peter

Thank you all so much...will see if I can find the others to complete the set.. enjoyed reading the history background about these stamps. Saw another person forum writing about in past in the community forum it after informed exact area..

Make sure to check for the spotting features for forgeries as you assemble a neat little collection.