If this isn't a knife sharpener, please let me know what it is. It could be to sharpen razors. The spaces are rather narrow for a knife blade. It is made by Sky-line in Burnley England and has a whole list of patent/registration numbers on the bottom. It has a painted wooden handle and the rest is steel. This is a very solid piece. My guess is that this was made in the 1930s or 40s.
The following information was sent by a reader:
"I have one of these 'kitchen tools' and have always used it as a knife sharpener for my bread knife and other large knives. It was always to be found in my mother's kitchen drawer and when she died I claimed it. She married in 1936 so I think you were right with your dates."
Just received another testimonial from a reader.
"I have an identical knife sharpener from Skyline. my parents were married in Ayrshire, Scotland in 1920. I also have original very sharp long breadknife and one small veg knife both sharpened by that device. I have been using it since my parents died in 1977. I use it regularly. but not on the bread knife little used now but I still use the small one".