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This review is from: Winsor & Newton WN6677233 A4 Hard Back Sketch Book (Office Product)
The case and paper in this book are a good quality, but unfortunately the pages aren't bound together too well until you get a considerable way in. I'm assuming its gummed rather than stitched down the spine as the first few pages fell out completely after a few hours use, however it was nothing to do with the perforations.
Like another reviewer who had similar issues, I am left handed and perhaps this type of gummed binding isn't suitable for us lefties!