Hi Jan,
It is really good of you to help with this and the reason for your difficulty in finding him can be explained by the following additional information I have just been given:
He is on the index 1880 Swedish Census CD. However, he had left without registering out of the parish and he was listed on a page for the "nonexistent".
Per Ivar Blomberg was born on 11 Nov 1859 and baptised 20 Nov in Hedvig Parish, Norrkoping. Father was Johan Peter Blomberg and mother Carolina Persdotter.
Any information on his parents birth/marriage etc and any siblings would be greatly appreciated.
Thanks,
Colin