Salt and pepper shakers Dutch(?)

As I went to get a book from the attic I found a pair of old porcelain salt and pepper shakers. Since my parents visited Holland in the 1950's I suppose these were picked up by them back then. So, I wonder - do you also think they are Dutch? Were these shakers made in the 50's or were they already antiques back then? Any ideas and thoughts would be appreciated. My photos were too big so the photos below lead to a Swedish image host.

 

They are marked "Delft" so would imagine they were made in the Netherlands. Very likely a (new at the time) souvenir from your parents' trip. Pottery, not porcelain, by way.

Debora

 

The IO combined mark on your one piece shows it is from the Ons Ideaal factory in Gouda. The book "Discovering Dutch Delftware" shows the mark and says the factory opened around 1950 and closed around 1987.

 

Thank you so much for the quick and very informative answers. You have confirmed what I thought. You are great!